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The added weight of a suppressor also reduces recoil. Since pistols are light, the additional weight of a suppressor can greatly reduce recoil. The weight of a SilencerCO Osprey 45 ACP suppressor (0.65lb) installed on a fully loaded Glock 21 (full size 45 ACP at 2.47lb) will cut recoil energy by 21% due to the added suppressor weight. The same suppressor installed on a Glock 17 with empty magazine (full size 9mm at 1.55lb) will cut recoil energy by 30% due to weight alone. Total suppressor recoil reduction usually comes in around 25% for pistols and 15 to 30% for rifles. See my online Recoil Calculator for more info.
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I have used the .30 cal suppressor pictured below on several .308 rifles using subsonic 175 to 220 grain Sierra MatchKing bullets and Trail Boss powder. Subsonic .308 loads are very mild and a thick aluminum blast baffle is fully adequate. A 1:10" twist .308 barrel will stabilize a 220gr bullet at 1050fps. A 1:12 twist .308 barrel will not stabilize subsonic bullets. Low velocity bullets spin slower than full speed rounds so a tighter twist is needed for heavy and slow subsonic rounds. Trail Boss pistol powder works well because it's fast burning for less muzzle blast and it's a low density powder that will fill more cartridge space for more consistent subsonic velocity.
I was really surprised by how quickly suppressed semi-auto rifles gum up. I have an NFA M-16 and when run at full-auto with a suppressor it will only run for about 200 rounds before it will stop functioning due to a dirty action. My rifle's primary failure mode is the hammer and hammer pin get dirty and slow the hammer action until it won't set off the primer. I use fixed, non-rotating hammer and trigger pins to prevent receiver wear from spinning pins so a gummed up hammer pin works directly against hammer movement. I get a new round in the chamber but no ignition at hammer fall. If you plan to shoot a lot of suppressed AR rifle then plan to clean it after every shooting session.
45ACP defensive ammo is designed to fully expand at subsonic velocity so it's a proven, inexpensive solution with excellent stopping power. The cost of 147gr 9mm subsonic ammo can be higher than 45 ACP ammo too.
For hunting distances I recommend 300 Blackout because of the excellent BC and aerodynamic efficiency of the 200 to 220 grain subsonic 30 caliber bullets. There are several new 300 Blackout subsonic hunting rounds available that will fully expand at subsonic velocities such as thisHornady andUnderwood ammo. 2ff7e9595c
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