Best Calibers for Suppressed Shooting
Woody's answers are based on published federal and state law. Not legal advice. Consult a licensed attorney for your specific situation.
Subsonic cartridges like .300 Blackout, .45 ACP, and .22 LR deliver the best suppressed performance. Heavy bullets at low velocities eliminate the sonic crack that defeats suppressor effectiveness.
How This Affects Your Shooting
Suppressor effectiveness depends entirely on keeping bullets subsonic since no can eliminates the sonic boom of supersonic projectiles. The gas volume and burn characteristics of your chosen cartridge directly impact how much sound reduction you'll actually achieve. Understanding these ballistic fundamentals lets you select ammunition that maximizes your suppressor investment.
The Detail
The physics of suppressed shooting revolve around two sound sources: muzzle blast from expanding gases and the sonic crack of supersonic bullets. Suppressors only address the first issue, so any bullet exceeding roughly 1,100 fps will still produce that distinctive crack regardless of your can's design. This makes naturally subsonic cartridges like .45 ACP and heavy .300 Blackout loads ideal candidates.
.300 Blackout stands out as perhaps the most versatile suppressed cartridge because it was designed specifically for this application. Heavy 220-grain loads typically run around 1,000 fps from rifle-length barrels, delivering solid terminal performance while remaining subsonic. The cartridge uses standard AR-15 magazines and bolts, making it an easy conversion for existing platforms.
Rimfire cartridges like .22 LR offer excellent suppressed performance due to their low pressure and velocity characteristics. Standard velocity .22 LR runs well below the sound barrier while high-velocity loads often go supersonic, creating that telltale crack. The small case volume means less gas expansion for your suppressor to handle.
Pistol cartridges generally suppress well because most were designed for shorter barrels and moderate velocities. .45 ACP remains subsonic in nearly all loadings, while 9mm requires careful ammunition selection since many loads exceed 1,100 fps. Heavier bullets in any pistol caliber typically stay subsonic while maintaining adequate expansion for defensive use.
Build Impact
Your suppressor and ammunition choice should be matched from the beginning since cartridge characteristics directly affect sound reduction performance. Factor in ammunition cost and availability since subsonic loads often carry premium pricing compared to standard velocity options.