No joy with heavies, other than the 220 Hornady RN. And use a standard buffer spring or one that does not increase the The best terminal ballistics in subsonic calibers come from large bore loaded with heavy pistol bullets. 223 Rem., and I've seen pictures in social. The round uses the same magazines as 5.56 NATO /. Certifiable has done some pretty good work on Subsonic powders for both carbine and pistol gas systems. Make sure you do not have any added weights to your bolt carrier. 300 Blackout, especially with subsonic loads, solves a lot of those issues. Trail Boss (lightweight subs, will not function AR15) IMR 4198 (heavy grain bullets, seems better in heavy subs). This will NOT stabilize in a 1:8″, 1:9″ twist barrel or slower! Priced per 50 rounds.Ĭarbine or pistol length gas system (will not cycle in mid-length or rifle length gas system)ġ:7″ twist barrel or faster (1:6.5, 1:6″). This ammo is designed for the AR-15 platform. Hell if it wont I may dump it and stick with the. I am also starting on my pof 308, will they cycle subs or no. I will just stay with a reg load then and shoots the subs through the bolt. With the suppressor on it does nothing but is sneaky quiet. PLEASE read below, the rifle specifications needed for this ammo!!!Īfter years of working on this project, I finally got an awesome cycling SUBSONIC load in 223/5.56 for an AR-15!! 112 grain EXPANDING SUBSONIC bullet! I worked closely with a bullet manufacturer to tweak the bullets and worked with many different powder and powder charges to dial it in. It cycles fine with my reg load but I just started with the subs and was wondering what to do.

223 subsonic load in ar15 pistol