And then there’s the case taper: which enables great semi automatic reliability but doesn’t work well with the straight magwell and magazines of the AR15. Find the Hunting Gear guy on YouTube, © Suppressed!! The negative side to that low speed is the rainbow arc to hit your target at longer ranges. The 300 Blackout was designed with a few things in mind: For a civilian shooter, getting into 300 Blackout when you already have an AR-15 is pretty easy: you can buy a dedicated upper to have some flexibility, or switch to a 300 Blackout barrel for a permanent mod and you’re done. I’m going to be a bit of an a-hole and throw one more out there: subsonic vs supersonic. Subsonic loads for 9mm commonly use 9.5 grams (147 gr) bullets at velocities of 300 metres per second (980 ft/s). It’s not too expensive at major retailers, but local stores may not have any or it might be super expensive. The tougher part to account for on these heavier bullets is the rainbow trajectory. Each ASR muzzle brake comes with a shim set and rocksett for easy … Combined with firearm sound suppressors, subsonic ammunition may significantly reduce sound levels compared to normal ammunition. Many AR-15’s will only handle an 80 grain 223 bullet, limiting energy at subsonic velocities compared with a 200-230 grain 30 cal bullet in a 300 Blackout. For me, that’d mean a slightly higher cost on 223 hunting ammo compared with reloaded 300 Blackout rounds, but at the volume of ammo needed for hunting deer yearly, who cares? For these ammunition loads, balancing bullet weight and velocity are required to ensure that the ammunition will still reliably cycle semi-automatic firearms. CCI has outdone themselves and created its own ammo optimized exclusively for firearms with suppressor usage. When it comes to hunting ammo, I really think 223 benefits from running premium bullets since you stand a real chance of impacting a game animal at very high velocities if you take a close shot. Some examples include .300 Whisper / 300 AAC Blackout (7.62×35mm), .338 Whisper, 9×39mm, 12.7×55mm STs-130, .510 Whisper. The Vortex Strike Eagle 5-25x56 FFP has landed. Wow, so little drop in velocity, but I guess that’s what happens when it’s poking along so slowly that wind resistance is minimal. We’d stack them up like that hunting at night. The high speed and short time to target also helps the 223 in wind drift, where it beats the 300 Blackout by around 50%-80% depending on range. Delivering similar ballistic performance to the 7.62×39, but using a slightly lighter bullet, the 300 Blackout alleviates some hunter’s concerns around bullet mass on game AND makes for a handy suppressed round in an AR-15. Boom; flexibility achieved. Some manufacturers offer AR-15’s that run 7.62×39, but that cartridge isn’t the best for the AR-15. Not such a big deal when you’re comparing a 1″ drift to a 1.6″ drift at 100 yards in a 10 mph crosswind, but considerably better at 500 yards where the 223 will drift around 30″ compared with the Blackout at 50″. Making an accurate hit at 200 yards with a subsonic round is a bit of fantasy, because you’re looking at 30+ inches of drop even if you sighted at 100 yards. This effect is much less pronounced for supersonic loads. Let’s dive into the 300 Blackout as it performs against the .223 or 5.56×45 round. I forgot to add. Well, in short, subsonic ammo doesn't break the sound barrier. Compared to the high-velocity (supersonic) unsuppressed condition, the combination of subsonic low-velocity ammunition and a firearm suppressor provided a reductions of 45, 38, 40, and 48 dB, peak sound pressure level at the muzzle, left, right ears and behind the shooter, respectively.

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