I found a little info from US guys doing sub sonic ammo for their AR15's. Last edited by Stengun 08-26-14 at 08:56. Speed of sound is 1,125 fps right (thanks Wikipedia) so you want to be shooting a bit slower than that. 223 case for subsonics is a waste of time and money. 22 conversion using a 1-9 twist barrel and 60gr SSS ammo from Aguila. All you can hear is the bullet smacking the steel swinger. The very best subsonic 223 load for any of these rifles is a. I cheched this myself with a MP3 recorder and mic and in person by standing a safe distance behind a barricade ( huge white oak ) from the 6" swinger. When fired even single shot through an AR w/ suppressor these rounds do not make any noise that can be heard at that distance. 22LR.įor SHTF situations this load can easily kill a person or deer size game at 175yds with a head shot. I'm not sure you could safely work a load that would work with heavier bullets. Loads using the PRVI 75gr BTHP-M bullet are pretty impressive compared to a. Hodgdon's website lists subsonic loads using 4gr of Trail Boss, 3.1gr of Titegroup, and 3.2gr of Clays at 1074, 1064, and 1060 fps respectively, HOWEVER, these loads are with Hornady 55gr FMJ. 223's w/ Hornady 60gr HP 1,050ft/sec ( just for kicks ) that shoot flatter, are more accurate and have more energy at 175yds ( I have a target stand w/ 6" swinger at 175yds ) than the SSS. The Aguila 60gr SSS only has a muzzle velocity of about 950ft/sec with a round nose bullet and I have loaded a few. 22LR round that has the downrange terminal ballistics of a subsonic 60gr or heavier bullet. A 22lr of 40gr traveling 1280 fps makes 145.49 ft lbs, that's about 2/3's of the energy of the slower 223. Using 55f the bullet would need to be below 1112.08 fps, and I've found a 1:9 can stabilize a bullet of 73gr making 200.42 ft lbs of energy. Actually if I was going to build a suppressed big bore AR I would go with something based on the 6.8 brass and. Bullet length, not weight, is what determines what twist is best. 300BU/Whisper/etc would be nice but the OP asked about subsonic.
Subsonic 223 loads forum full#
Quote:case: Lake City Surplus, previously firedĬharge Weight Tested: 4 grains to 14 grains.If I wanted a suppressed AR I would go with the 300 Black Out. Low-High Full auto conversion - Saiga-12 - forum Glock17PistolFullAutoConversion We want law abiding skilled. is being offered in this load as well as both a subsonic load (MidwayUSA 948-223) and. Here is his original load data that I saved and used. I went heavier than he did as he stopped at 55 grains IIRC. 223 loadings which were still WELL above subsonic velocities using a couple of different powders and bullet weights and even with modified super-light buffers and a carbine gas system nothing would cycle the action. A couple of years ago I did some experimentation with downloaded. 223 ammo: Everything needed to create a subsonic 55 grain round that will deliver 128 ft/lb energy at 1000 FT/s Bullets, casings, scale, sharpie, cotton balls, punch tool, Trail Boss powder As you can see, the Trail Boss powder is seriously huge. Cycling the action isn't even close to being a possibility. Loads, there is a member on the Accurate Reloading Forums named Seafire, his data is the data I started out with and it works well since that time I have used his initial load development for loading a wide range of bullets. Here is a general step-by-step on making subsonic. Give Blue Dot and Red Dot a try, both work really well for reduced 223. You can get various 22LR ammo that is subsonic and works well in a. I have been loading and shooting subsonic for years in a 223. Never heard of anyone doing that since the bullet is heavy and would be moving so slow.
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