For the most part, subsonic rounds mean heavier bullets, but there are a few other variables that come into play when optimizing a subsonic round. What we don’t talk about often enough is ammo choices. Long, short, mounting systems, and more are the characteristics that will help you spend your money wisely. As I have stated many times in the past, the perfect 300BLK silencer is the one that fits most of your intended needs. We have talked at length about 300BLK platforms and suppressors, focusing on utility, enjoyment, and of course noise reduction. If you want maximum stopping power and flatter trajectories, but still want to run a can but do not expect to be hearing safe, then go 556.SILENCER SATURDAY #203: Is All Subsonic 300 Blackout Created Equal? If you also want to use it up to 300 yards, go with 300blk. It will be marginally cheaper to buy, the ammo will be much cheaper to buy, and it will perform similarly. If your only concern is to be hearing safe and the weapon is strictly a home defense gun, then personally I would just make a pistol caliber carbine. If overpenetration is a concern, both will have issues, although 556 will perform better in that regard. In that regard, 300blk will hit harder, but be louder (both marginally). A better equivalent would be 300blk supers vs 556. It's more versatile than a pistol caliber carbine.Ī 10.5" supressed 556 will hit a good deal harder than 300blk subsonic, but will also be much louder. The big upside to 300blk is that you can also run supers, which greatly extend your range, and pack much more stopping power. Supressed, you can achieve hearing safe with 300blk subs. 300 blk subsonics hit marginally harder than 45acp, and have a somewhat longer range.
Tldr- fmj subs suck at everything except making you giggle, supers are king for killing things but appropriate subsonic loads will do the job just fine. Think training pistol ammo is the normal sub loads and Lehigh are top dollar hollow points I have shot many animals with these and can personally say my internet opinion is a few of these in the chest will kill things real dead, supers just kill them deader. Still not as good as supers but very usable if desired. Their 210 gr maximum expansion work wonder as the are specificly made to expand at subsonic velocity.
Now, if you look into actual defense sub loads such as the Lehigh offerings it changes the game a little bit. Also these types of subs penetrate deeply so more rounds needed down range means more chances of bullets going through and hitting unintentional targets. Subs will work, especially in a ar platform where you can very easily put multiple rounds in a target but that doesn't mean they are the best tool for the job. So in a general situation supers are better because most people under the kind of stress that comes in this situation can barely hit a barn let alone a moving heart sized target. The shock from the round can destroy things in a large area around the actual wound cavity. What you get with super sonic is the ability to destroy vital organs like the heart with out a direct hit. A shot to the heart or head will drop them as fast as any other bullet. Will it kill them if proper shot placement is had? Absolutely. No expansion and it will just lawn dart through a person. Before anyone jumps down my throat yes normal off the self subsonic ammo is terrible self defense ammo as it is basically a 45 acp fmj. He's my opinion take it or leave it.the stopping power argument when talking about this is silly if correct bullets are chosen.
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