SSS.6.228 - FOR Systems Predator 6.5 and the Seekins HAVAC 6.5 PRC (Free Version)
/FOR Systems Predator 6.5 on a Seekins HAVAC PH3 6.5 PRC with 20-in Barrel
The Predator 6.5 is designed and manufactured by Front of Rifle (FOR) Systems. It is a 6.5mm centerfire rifle silencer, intended to suppress many cartridges with projectiles appropriately sized to travel through the bore up to and including 6.5 Weatherby Rebated Precision Magnum (RPM). It has a 1.62-inch diameter and is 8.8 inches long; the length increases to 9.34 inches with the use of a HUB coupler and SOB brake mount installed. Other mounting options are possible due to the rear of the silencer body being HUB compatible (1.375-24 tpi threading). The silencer is entirely 3D-printed from Grade 5 Titanium. The silencer weighs 11.3 ounces, and the HUB mount coupler and SOB brake weigh 4.1 ounces, for a total system weight of 15.4 ounces, as tested. The Predator 6.5 can be obtained from Silencer Shop.
Silencer Hazard Map:
The predicted personnel hazards generated by the tested weapon system in this report, in the free field, are shown in the adjacent Silencer Hazard Map. Click or tap the Map to enlarge. Please reference Silencer Hazard Map Brief 8.1.25 for further details. The PEW-SOFT HD Blast Hazard Prediction Tool and Hazard Mapper is presented in Report 8.1.1.
FOR Systems Predator 6.5 20-in barrel 6.5 PRC Bolt-Action Free Field Hazard Map Produced by PEW-SOFT HD Blast Hazard Prediction Tool using PEW Science Test Data
PEW Science is an independent private testing laboratory and also hosts the world’s only independent public suppressed small arms research cooperative. Testing, data analysis, and reporting is generated with funding provided by PEW Science members. Any test data that is generated with any portion of private funding contains this disclosure. The testing and analysis production for this Sound Signature Review was funded in part by PEW Science Project PEW-FOR-155-001-26. Therefore, data pertaining to the Predator 6.5 in this Sound Signature Review is published with the express written permission of DB Technologies, LLC.
This review contains single test results using the FOR Systems Predator 6.5 with the SOB brake mount on the Seekins HAVAC PH3 bolt-action rifle, chambered in 6.5 PRC with a 20-inch barrel. Hornady ELD Match 6.5 PRC 147gr ammunition was used in the test.
Section 6.228.1 contains Suppression Rating comparisons of the Predator 6.5 with the Top 5 .30 caliber silencers evaluated on .308 bolt-action and 6.5 CM. Unsuppressed muzzle blast pressure and impulse comparisons are provided comparing the behavior of 6.5 PRC and .308.
Section 6.228.2 contains the FOR Systems Predator 6.5 test results and analysis.
Section 6.228.3 repeats the initial summary suppression performance comparisons with additional commentary.
Section 6.228.4 contains the review summary and PEW Science laboratory staff technical opinions.
Summary: When paired with the Seekins 20” 6.5 PRC and fired with Hornady 147gr, the FOR Systems Predator 6.5 with an SOB brake mount achieved a Suppression Rating™ of 56.2 in PEW Science testing.
As with all weapon systems, the user is encouraged to examine both muzzle and ear Suppression Ratings.
Relative Suppression Rating Performance is Summarized in SSS.7 - PEW Science Rankings.
6.228.1 FOR Predator 6.5 Performance Summary and 6.5 PRC vs. .308
The PEW Science Silencer Sound Standard includes the evaluation of several centerfire small arm cartridges. This report introduces examination of 6.5 PRC combustion phenomenology and introduces its suppression from a 20-in barrel bolt-action rifle. The following bolt-action platforms have been used in the published research to date:
.308 bolt-action rifle
6.5 CM bolt-action rifle
300 BLK bolt-action rifle
9mm bolt-action pistol
This report primarily addresses the comparison of .308 and 6.5 PRC combustion suppression. The early (and single) 6.5 CM test in the Silencer Sound Standard is included in limited performance comparisons due to the barrel length difference (22-in vs. 20-in) and its parent case being similar to .308. The 6.5 PRC cartridge was selected for inclusion in the Standard for its 6.5mm diameter and its higher pressure and longer duration combustion. This testing and analysis forms a bridge to future magnum cartridge research (.300 Winchester Magnum) while simultaneously enabling the evaluation of 6.5mm bore silencers. The 6.5 CM cartridge is therefore deemed superfluous for all intents and purposes, in the context of the research.
Unsuppressed and suppressed muzzle blast pressure histories were measured from all systems in the free field. Data reduction was performed to derive blast impulse histories as well as computations of the PEW Science Suppression Rating DRC metrics at the fielded pressure sensor locations in accordance with the Silencer Sound Standard and compatible with MIL-STD 1474E.
Suppression Rating calculations for the Top 5 performing .308 bolt-action silencers, the single 6.5 CM silencer test, and the subject 6.5 PRC silencer test are summarized in Figure 1.
Figure 1. Suppression Rating and Length Comparisons Of Rifle Silencers Suppressing 6.5 PRC, .308, and 6.5 CM Using PEW-SOFT Data and Analysis
From the above performance comparisons, it is apparent that the performance differentials between all of these silencers are not extreme. However, there are some parametric differentials that are significant:
Length, in general, is a good predictor of overall silencer suppression performance. There are most certainly outliers highlighted throughout the Standard (i.e. “short” silencers that outperform “long” silencers in a given combustion regime), but by and large, on average, longer silencers tend to outperform shorter silencers. It is interesting to note that the lengths of the silencers in Figure 1 range from 8-in to 10.3-in, mount-inclusive. This is actually a rather large length range. The fact that the silencers perform somewhat similarly to each other, despite the length differentials, highlights how different technologies have different performance scaling.
Particularly interesting is the CGS Hyperion case. An over-bored .30 caliber silencer (some report firing .338 projectiles through the Hyperion with perfect bore alignment), the silencer is highly sensitive to pressure injection depth within the first expansion chamber. The 6.5 CM test provides somewhat spurious performance comparison, as the barrel in the test was 22-in long, contrasted with all of the .308 tests and the subject 6.5 PRC test barrels being 20-in long, but its elevated performance while in a shorter mount configuration than its .308 evaluation is notable (10.3-in length in the .308 test vs. 9.5-in length in the 6.5 CM test).
The performance of the subject silencer, the FOR Systems Predator 6.5, highlights how even when increasing combustion pressure input and duration, similar suppression performance can be reached. For example, the Liberty Precision Mach-L (6.163) is the same length, as tested, and offers similar personnel protection when used with the lower pressure .308 cartridge. As research continues, conclusions will be drawn as to whether this highlights advanced performance of the Predator 6.5, or lagging performance of the Mach-L. It is likely the former will be the case.
The actual combustion input into the silencers does vary, based on cartridge. Though not a true long-action magnum cartridge, 6.5 PRC can be classified as a “short-action magnum” and its pressure and duration does differ somewhat significantly from .308 out of the same barrel length. To illustrate the differences of what a silencer would be expected to suppress with the two cartridges, unsuppressed blast loads from three different weapon systems are presented in the subsection below. Both unsuppressed 20-in barrel bolt-action blast loads are presented, along with 14.5-in semiautomatic blast loads with 7.62 NATO.
6.228.1.1 Unsuppressed Muzzle Blast Loads - .308 vs. 6.5 PRC
Typical unsuppressed muzzle blast pressures measured from 20-in bolt-action rifles and a 14.5-in semiautomatic rifle, in the free field, are presented in Figure 2. The time scale has been trimmed such that significant early time waveform features can be viewed in detail. Therefore, later time weapon mechanics signatures from the 14.5-in SR-25 are not shown (please reference the full-time scale suppressed system data plots in relevant reports to view those phenomena). Note that each vertical axis provides pressure in different units. Metric pressure units are on the left axis [Pa] with imperial pressure units on the right axis [psi]. The vertical axes scales are linear. Logarithmic pressure units with 20 micropascal reference [dB] are shown in plot annotations.
Fig 2. Unsuppressed muzzle Blast Pressure from 6.5 PRC and 7.62 NATO Rifles measured by PEW Science with PEW-SOFT
Similarly to the above, unsuppressed muzzle blast impulse, in the free field, is presented in Figure 3. Again, linear metric and imperial units are presented with logarithmic units annotated on the plot. The time scale is kept similar for comparison.
Fig 3. Unsuppressed muzzle Blast Impulse from 6.5 PRC and 7.62 NATO Rifles measured by PEW Science with PEW-SOFT
From the above raw blast overpressure and impulse plots, it can be concluded that:
Primary blast from 6.5 PRC is significantly more severe than from .308, from the same barrel length.
Coincidentally, the peak pressure amplitude from 14.5-in barrel 7.62 NATO is similar to that of 20-in barrel 6.5 PRC. However, as described in Public Research Supplement 6.210, there is a significant secondary blast wave measured in the 14.5-in barrel 7.62 NATO signature. This blast wave is produced by the rapid afterburning of fuel (propellant) not consumed during the projectile push through the gun barrel. Upon muzzle exit, this propellant contributes significantly to the measured blast overpressure and blast impulse. Typically, short barrel 7.62 NATO secondary blast occurs later in time than short barrel 5.56 NATO secondary blast due to propellant mass and gas volume, as detailed in the above referenced Research Supplement.
The additive positive phase impulse from the phenomenon in (2) that occurs later in time indicates that for a given .30 caliber silencer, 14.5-in 7.62 NATO testing would not be a suppression performance proxy for 20-in barrel 6.5 PRC testing, despite the similar peak blast pressures and impulses alluded to above. Furthermore, the jet diameter and overall combustion durations are different, resulting in a different input load into the silencer in both in geometry and timing.
The volumetric flow demand from the 20-in barrel 6.5 PRC system is higher than the 20-in barrel .308 system. This is expected to play a role in multiple performance phenomena in the research.
PEW Science encourages the use of silencers with small arms. The suppression of primary muzzle blast significantly reduces personnel hazards when compared to the firing of unsuppressed small arm weapon systems.
Detailed suppressed signature evaluations of the FOR Systems Predator 6.5 suppressing the 6.5 PRC bolt-action rifle follow.
6.228.2 FOR Systems Predator 6.5 Sound Signature Test Results
A summary of the principal Silencer Sound Standard performance metrics of the FOR Systems Predator 6.5 is shown in Table 1. The data acquired 1.0 m (39.4 in) left of the muzzle is available for viewing to all. The data acquired 0.15 m (6 in) right of the shooter’s ear is only available to membership supporters of PEW Science and the Silencer Sound Standard. You can support public PEW Science testing, research, and development with a membership, here. State-of-the-art public firearm sound signature testing and research conducted by PEW Science is supported by readers like you.
Table 1. FOR Systems Predator 6.5 Sound Metric Summary
6.228.2.1 SOUND SIGNATURES AT THE MUZZLE
Real sound pressure histories acquired with PEW-SOFT™ are shown below. The waveforms are not averaged, decimated, or filtered. The data acquisition rate used in all PEW Science testing is 1.0 MS/s (1 MHz). The peaks, shape, and time phasing (when the peaks occur in relation to absolute time and to each other) of these raw waveforms are the most accurate of any firearm silencer testing publicly available. PEW-SOFT data is acquired by PEW Science independent testing; the industry leader in silencer sound research. For more information, please consult the Silencer Sound Standard.
The primary sound signature pressure histories for all 5 shots with the FOR Systems Predator 6.5 are shown in Figure 4a. The sound signatures of Shot 1, Shot 2, and Shot 3 are shown in Figure 4b, in early time. The real sound impulse (momentum transfer potential) histories from the same 5-shot test are shown in Figure 5a. In Figure 5b, a shorter timescale is shown comparing the impulse of Shot 1 to that of Shot 2 and Shot 3.
Fig 4a. FOR Systems Predator 6.5 PRC Bolt Action Rifle Muzzle Sound Pressure Signature
Fig 4b. FOR Systems Predator 6.5 PRC Bolt Action Rifle Muzzle Sound Pressure Signature, Short Time Window
Figure 5a. FOR Systems Predator 6.5 PRC Bolt Action Rifle Muzzle Sound Impulse Signature
Figure 5b. FOR Systems Predator 6.5 PRC Bolt Action Rifle Muzzle Sound Impulse Signature, Short Time Window
The FOR Predator 6.5 is a full-size 6.5mm rifle silencer that shares some design features with the Monarch (6.155) and Recce (6.195) line of silencers from FOR Systems, particularly on the first reflector (blast baffle) in the first expansion chamber. Like those aforementioned silencers, the Predator 6.5 is classified as a hybrid design, incorporating both high flow rate features and conventional geometries to control distal blast propagation while reducing adverse influence on weapon function. For an overview of the three primary classes of rifle silencer designs in the PEW Science Silencer Sound Standard research taxonomy, the reader is encouraged to review PEW Science Research Supplement 6.169.
PEW Science Research Note 1: The Predator 6.5 has a high early-time flow rate and an extremely throttled late-time flow rate, as displayed in the above raw blast overpressure and blast impulse signatures from the subject test. Principally, high early-time flow rate into annular space can pay performance dividends in system suppression even without the need to lower back pressure on reciprocating rifles. The stagnation relief provided by technologies such as those present in the Predator 6.5 enable significant suppression performance with high pressure combustion input. A historical example from the research of such behavior is seen in the previously highlighted CGS Hyperion. Specific behaviors noted in the test of the FOR Systems Predator 6.5 with high pressure and long duration 6.5 PRC combustion input, observed in the above test data, are:
Extremely long duration pressure blowdown, lasting over 110 ms from initial onset (Fig. 4a).
Highly controlled precursor flows and coupled jetting in early time (Fig. 4b).
Immediate, but very gradual first-round-pop (FRP) divergence in both pressure space (Fig. 4) and impulse space (Fig. 5).
Strong consistency in post-FRP momentum accumulation, with gradual decay to steady low amplitude long duration jetting (Fig. 5b).
Very long duration positive phase momentum accumulation that does not transition to negative phase impulse until after ground reflection is complete (Fig. 5a).
PEW Science Research Note 2: The Predator 6.5 is an extremely efficient gas trap. It is likely that operators and bystanders will perceive the signature as a long duration “PUSHHH-shhhhhh,” to offer an appropriate onomatopoeia. Another synonymous event may be “the unexpected disconnection of a high pressure air hose coupler from a pneumatic apparatus,” after coupled bullet shock (projectile Mach wave disturbance coupled with initial gas jetting from the silencer). The dedicated 6.5mm bore (0.295-in, or 7.4mm true exit bore, per PEW Science Laboratory measurements and the manufacturer website) most certainly assists with controlling late-time flow during long duration high pressure 6.5 PRC combustion blowdown. The blast overpressure and impulse signatures presented above represent the longest duration signatures presented in the public research pedigree, to date, possessing durations on par with the presented complete AK rifle signatures that feature severe late-time action noise. These examples, along with many others in the research pedigree, highlight one of the key reasons why complete suppressed small arm signature characterization is only possible with true free field testing in accordance with the MIL-STD 1474E compliant Silencer Sound Standard.
PEW Science Research Note 3: This length class of rifle silencers represents an extremely competitive section of the market. As silencers reach and eclipse the 8-in total length threshold, performance begins to greatly increase. Note there are outliers (some shorter silencers provide exemplary performance) but this general rule holds true. The reader is encouraged to use the Suppression Rating Parametric Visualization Tool (Members Only) in the Rankings to filter by length and weight and view the competition spatially. Note that this is the first 6.5 PRC test published in the Standard, and as such, there are not yet directly comparable tests available. However, the Top 5 performing .30 caliber silencers tested on .308 displayed in the introduction to this report give a window into general performance comparisons that can be drawn:
The Predator 6.5 is the same length, mount inclusive, as the Liberty Precision Machine Mach-L (6.163). The Predator outperforms the Mach-L, even with the more severe 6.5 PRC input. Whether this performance relationship scales to the 6.5 PRC performance of the Mach-L remains to be seen. Note that a 6.5mm end cap is available for the Mach series.
The Predator 6.5 is slightly shorter than a direct-thread CGS Hyperion (6.27) without a Hyperion thread adapter, which was the configuration used to test the Hyperion with 6.5 CM from a 22-in barrel. While most certainly not apples-to-apples due to cartridge and barrel length, this performance comparison does pose some interesting questions regarding the performance potentials of both technologies. While 6.5 CM is more similar in combustion severity and duration to .308, the Hyperion’s high performance with over-bore can’t be overstated. Nonetheless, it remains to be seen how shortening the barrel and increasing pressure and duration impact performance. Unpublished experiments with Hyperion-technology-equipped silencers have shown strong performance with .338 Lapua Magnum, for example. Regardless of these unknowns, 6.5 PRC FOR Systems Predator 6.5 performance is likely strikingly similar to 6.5 CM Hyperion performance, based on available data. When lengthening a Hyperion system with a thread adapter with .308, performance can drop.
The PTR VENT 1 (6.160) outperforms the Predator 6.5 in pure suppression, but again, that is comparing .308 through the VENT 1 to 6.5 PRC through the Predator 6.5. The useful comparison here is that extremely similar operator protection can be achieved with the Predator 6.5 on a “short-action magnum” as the currently top performing .30 caliber silencer on a .308. That, alone, is notable to highlight.
As typically indicated, first-round sound signatures always differ from subsequent shots, as the atmosphere within the silencer changes. The FRP phenomenon cannot always be shown by viewing only the peak sound pressure. This is one of the reasons why The Silencer Sound Standard requires examining multiple sound signature metrics. Ammunition consistency can play a role in the determination of FRP, however, the close examination of measured pressure and impulse waveforms typically excludes ammunition from the possible factors influencing true FRP, due to the relative consistency of most high quality factory ammunition.
PEW Science has made a concerted effort to characterize the FRP phenomenon with true physiological human inner-ear response analyses. Additional PEW Science Member Research Supplements containing this information are released periodically.
The FOR Systems Predator 6.5 shooter’s ear suppression performance is examined in the full Member Version of this report.
The overall performance summary presented in Section 6.228.1 is repeated below with additional commentary.
6.228.3 Relative Suppression Rating and Length Comparisons (.30 Rifle Silencers)
The FOR Systems Predator 6.5 suppressor is intended to offer high sound signature suppression across the pressure field, dedicated to 6.5mm rifles.
Figure 8 shows supersonic suppression comparisons between selected 7.62mm (30 caliber) rifle silencers shown in public PEW Science Sound Signature Reviews, as of the date of this review publication suppressing both .308 and 6.5 CM, compared with the Predator 6.5 suppressing 6.5 PRC. The results shown in Figure 8 are calculated from real test data acquired with PEW-SOFT.
Figure 8. Suppression Rating and Length Comparisons Of Rifle Silencers Suppressing 6.5 PRC, .308, and 6.5 CM Using PEW-SOFT Data and Analysis
From the above performance comparisons, it is apparent that the performance differentials between all of these silencers are not extreme. However, there are some parametric differentials that are significant:
Length, in general, is a good predictor of overall silencer suppression performance. There are most certainly outliers highlighted throughout the Standard (i.e. “short” silencers that outperform “long” silencers in a given combustion regime), but by and large, on average, longer silencers tend to outperform shorter silencers. It is interesting to note that the lengths of the silencers in Figure 1 range from 8-in to 10.3-in, mount-inclusive. This is actually a rather large length range. The fact that the silencers perform somewhat similarly to each other, despite the length differentials, highlights how different technologies have different performance scaling.
Particularly interesting is the CGS Hyperion case. An over-bored .30 caliber silencer (some report firing .338 projectiles through the Hyperion with perfect bore alignment), the silencer is highly sensitive to pressure injection depth within the first expansion chamber. The 6.5 CM test provides somewhat spurious performance comparison, as the barrel in the test was 22-in long, contrasted with all of the .308 tests and the subject 6.5 PRC test barrels being 20-in long, but its elevated performance while in a shorter mount configuration than its .308 evaluation is notable (10.3-in length in the .308 test vs. 9.5-in length in the 6.5 CM test).
The performance of the subject silencer, the FOR Systems Predator 6.5, highlights how even when increasing combustion pressure input and duration, similar suppression performance can be reached. For example, the Liberty Precision Mach-L (6.163) is the same length, as tested, and offers similar personnel protection when used with the lower pressure .308 cartridge. As research continues, conclusions will be drawn as to whether this highlights advanced performance of the Predator 6.5, or lagging performance of the Mach-L. It is likely the former will be the case.
PEW Science Research Note 6: As stated in Research Note 3, the reader is encouraged to use the Suppression Rating Parametric Visualization Tool (Members Only) in the Rankings to filter by length and weight and view the competition spatially. Note that this is the first 6.5 PRC test published in the Standard, and as such, there are not yet directly comparable tests available.
It is clear that additive manufacturing dominates the performance Rankings, but design optimization in the traditionally (subtractive) manufactured silencer space is still possible as demonstrated by both the Magco Arms EDS-30L (6.219) and Liberty Precision Machine Mach series. As research into elevated combustion pressure and duration continue with 6.5 PRC and later with .300 Winchester Magnum, efficacy of these designs will be further tested.
The user is encouraged to be mindful of the degree to which sound signature suppression, and resulting personnel hazards, can vary across designs. Small arm weapon system suppression performance is a spectrum. The PEW Science Suppression Rating and the Silencer Sound Standard help quantify this spectrum for end users and industry, objectively.
6.228.4 Review Summary: FOR Systems Predator 6.5 on a Seekins HAVAC PH3 6.5 PRC with 20-in Barrel
When paired with the Seekins 20” 6.5 PRC and fired with Hornady 147gr, the FOR Systems Predator 6.5 with an SOB brake mount achieved a Suppression Rating™ of 56.2 in PEW Science testing.
As with all weapon systems, the user is encouraged to examine both muzzle and ear Suppression Ratings.
PEW Science Laboratory Staff Opinion:
The FOR Systems Predator 6.5 is a full-size centerfire rifle silencer dedicated to suppressing 6.5mm cartridges and smaller. Rated up to 6.5 Weatherby RPM, the performance of the Predator 6.5 with short-action magnum cartridges like 6.5 PRC is demonstrated to be high. Weapon operators will experience similar risk metrics when fielding the Predator 6.5 on these weapons as they do with top performing .30 caliber rifle silencers on .308 bolt-action weapons. As the Predator 6.5 is 3D-printed from titanium, its weight is appropriate for long-range hunting use despite its full size length. The Predator 6.5 can be adapted to a variety of rifle platforms as it is HUB compatible.
The FOR Predator 6.5 is a full-size 6.5mm rifle silencer that shares some design features with the Monarch and Recce line of silencers from FOR Systems, particularly on the first reflector (blast baffle) in the first expansion chamber. Like those aforementioned silencers, the Predator 6.5 is classified as a hybrid design, incorporating both high flow rate features and conventional geometries to control distal blast propagation while reducing adverse influence on weapon function. For an overview of the three primary classes of rifle silencer designs in the PEW Science Silencer Sound Standard research taxonomy, the reader is encouraged to review PEW Science Research Supplement 6.169.
The Predator 6.5 has a high early-time flow rate and an extremely throttled late-time flow rate, as displayed in the blast overpressure and blast impulse signatures from the subject test. Principally, high early-time flow rate into annular space can pay performance dividends in system suppression even without the need to lower back pressure on reciprocating rifles. The stagnation relief provided by technologies such as those present in the Predator 6.5 enable significant suppression performance with high pressure combustion input. A historical example from the research of such behavior is seen in the previously highlighted CGS Hyperion.
The Predator 6.5 is an extremely efficient gas trap. It is likely that operators and bystanders will perceive the signature as a long duration “PUSHHH-shhhhhh,” to offer an appropriate onomatopoeia. Another synonymous event may be “the unexpected disconnection of a high pressure air hose coupler from a pneumatic apparatus,” after coupled bullet shock (projectile Mach wave disturbance coupled with initial gas jetting from the silencer). The dedicated 6.5mm bore (0.295-in, or 7.4mm true exit bore, per PEW Science Laboratory measurements and the manufacturer website) most certainly assists with controlling late-time flow during long duration high pressure 6.5 PRC combustion blowdown. The blast overpressure and impulse signatures presented above represent the longest duration signatures presented in the public research pedigree, to date, possessing durations on par with the presented complete AK rifle signatures that feature severe late-time action noise.
This length class of rifle silencers represents an extremely competitive section of the market. As silencers reach and eclipse the 8-in total length threshold, performance begins to greatly increase. Note there are outliers (some shorter silencers provide exemplary performance) but this general rule holds true. The reader is encouraged to use the Suppression Rating Parametric Visualization Tool (Members Only) in the Rankings to filter by length and weight and view the competition spatially. Note that this is the first 6.5 PRC test published in the Standard, and as such, there are not yet directly comparable tests available. However, the Top 5 performing .30 caliber silencers tested on .308 displayed in the introduction to this report give a window into general performance comparisons.
The Predator 6.5 is appropriate to use with cartridges like 6.5 PRC and similar. The user is encouraged to contact the manufacturer for information requiring barrel length and firing schedule limitations for desired use cases.
In this review, the FOR Systems Predator 6.5 performance metrics depend upon suppressing a supersonic centerfire short-action magnum rifle cartridge; no easy task. PEW Science encourages the reader to remain vigilant with regard to all supersonic centerfire rifle suppression claims. The gas volume and combustion products created by the firing of the supersonic 6.5 PRC cartridge are significant even from long barrels; the measured pressure and impulse magnitudes, and their durations, illustrate this fact.
The hearing damage potential of supersonic centerfire rifle use is significant. PEW Science encourages the reader to consider the Suppression Rating when deciding on an appropriate silencer and host weapon combination for their desired use.
