Does anyone have any data or can point me to a reliable source for reloading data on 5.56 subsonic ammo? I'm well aware that current sub ammo will not function the BCG of an AR and the weapon platform is essentially a single shot. This project is focusing on subsonic first round capability followed-up with standard velocity ammo in AR mags. Also, there's the use in a bolt gun in which all rounds could be subsonic. I'm working in conjunction with another forum member to first develop good subsonic data for AR type and bolt action type weapons. Then, we're looking at an R&D project for a functioning, dedicated subsonic suppressed AR upper.