Once again it was fun, quite and easy to shoot. I then bought a 9mm conversion with a 9mm can. It was very cool as it did sound like a pellet gun but not one even came close to cycling the action no matter what bullet weight, spring or buffer I put into it. 223 through my AR-15 with all kinds of bullets. They are also much quieter than any center fire rifle no matter how well suppressed. On the other hand nothing beats the suppressed 10/22 or 22lr bolt rifle with a decent silencer and subsonic ammo for low price and low noise. Subsonic 223 is a waste of effort when the subsonic 300 whisper/blackout is readily available and does everything better. I have loaded my own subsonic 223 70 grain bullets with about 7 grains of H110 and it is no more quiet than 12 grains of H110 with a 240 grain 300 whisper/blackout with better BC and much higher power. You can't have the most powerful, most accurate and least noisy all in one package. In my experience shooting all of these suppressed, the subsonic 223 is by far the loudest, the std vel 22lr was the most accurate and cycles the 10/22 action nearly 100% and the SSS is unreliable and not much quieter than the 22lr.Īnyone who says that the 22lr in any configuration is a good substitute or like the 223 subsonic has no idea what they are talking about. The 60 grain SSS at 700 fps (the best I ever recorded over my chrony) has about 61 ft-lbs, the 40 grain subsonic 22lr has about 98 ft-lbs. I do not know of anyone who makes such an upper in 5.56.Ī 70 grain 223 bullet moving at 1050 fps has about 170 ft-lbs of energy. This gives it enough pressure to cycle subsonic loads and is adjustable to allow the hotter supersonic loads. On my 18" upper it has the gas port mounted about 4 inches from the front of the chamber. To cycle the 5.56 subsonic rounds you will need an upper that is similar to the 300 whisper. There are factory subsonic loads out there that claim to be able to cycle the action, but they are not reliable. I used an empty buffer and a cut down spring to cycle subsonic 458 socom loads in my ar-15. 300 BLK upper and get "close" to what you currently expect. 22LR can does a better job for a fraction of the cost after the initial purchase. It's not worth the effort, hence why nobody bothers trying to get one to run/cycle on subsonic ammo. Your expectations exceed what's possible with a 5.56 AR. Handloading basic rounds is simple enough if you're paying attention but handloading subsonics isn't something I'd recommend for a new reloader. They're a pain to get out of a barrel and if you miss it the next round is going to be a real surprise. Too little powder an you get yourself a squip. That little powder in a case (not even sure if you can use Trail Boss in 5.56.never looked into it) will be position sensitive and give you inconsistent burn rates/velocities. 22LR suppressor as well and just running that if you want "pellet gun quiet". With the PITA associated with loading your own subsonic 5.56 (not to mention the risk you run of plugging a barrel with an undercharged round), you're better off buying a. 22LR with my 5.56 suppressor do I need to worry about the lead bullets fowling it? It seems like that would be part of the fun of having one.īy the way if I shot. M193 ammo is probably fine normally for what I use it for, but if I put in the money and effort to get a suppressor I would like to make sure it can be "pellet-gun" quite on occasion. I mostly want a suppressor because I shoot a lot and sometimes I forget to bring my ear protection or people come with me and I don't have enough to go around. When you used your sub-sonic rounds were you using the standard buffer in your gun? Are the subsonic rounds more difficult to reload than normal (ie need to be more precise to make sure to get the muzzle velocity high enough to operate the gun, but still be sub-sonic)? If I reload anyways maybe it does not matter. I have been interested in getting into reloading anyways. Like others have said, its not worth the time to load up the bullets.
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