![]() Actually if I was going to build a suppressed big bore AR I would go with something based on the 6.8 brass and. 223 that won't cycle my AR's, but as I said he is interested and I told him I'd see what I could find. 300BU/Whisper/etc would be nice but the OP asked about subsonic. 308 Suppressor and see no need to mess with subsonic. I've discussed this with him and the only answer I get is he wants to try it, which I suppose is enough of a reason. So yes, for this your AR-15, barrel length ABSOLUTELY MATTERS to the bullets effectiveness in tissue: You will not get fragmentation below 2800 FPS out standard FMJ/Penetrator rounds. and the 22lr will cycle its action with a can. Load Data 2: pistol powders along with Unique. except with 22lr you dont have all of the headaches involved with creating a subsonic. 223 subsonic load working with a standard AR15 subsonic 223 loads with hercules unique powder. 223 is similar bullet weight at similar velocities. I see CFE223 mentioned here frequently but have never used it. Hornady® Subsonic Ammunition designed for accuracy and performance below the speed of sound now comes in both rifle and handgun loads. 223s is a 75gr Hornady match bullet and 25.5grs of CFE 223. Im not sure you could safely work a load that would work with heavier bullets. Not quite as flat shooting as a 77 SMK but they fragment out to 200 yards on coyotes at 2850-2900 fps. Hodgdons 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. ![]() If your are looking for a projectile with less mass, a 22 air rifle pellet loaded in a 223 case might require even less powder to launch at a satisfactory speed. Just another idea to throw out here but why dont he get a 10/22 rifle and a 22 can and shoot subsonic 22lr? thats all your creating here. It goes subsonic around 900 yards but still has a decent group at 1000. Seating a conventional bullet backwards might transfer more energy to a critter at low speeds, might be a good application for the low cost FMJ. I know they won't cycle the action of an AR but he wants to play around with the idea. 32 calibre pistol projectiles (.311), neither load is subsonic, but. 223 ammo to subsonic velocities? I know it can be done but my search didn't turn up anything.Ī friend's father is asking about it and I have no first hand experience. I’ve developed some superbly accurate loads for 303 using trail boss (15.1 gns) and 124 gn.
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