I have a 20" 1:12" M16A1 clone and want to assemble a handload that replicates Military 5.56 spec. M193. I previously tried a load utililing 26 grs. of Accurate 2230, a Hornady 55 gr. fmjbt, Winchester brass and non-magnum small rifle primers, but only got 3050 feet per second. M193 should be cruising at 3200 fps. from a 20" gun. I don't think that switching to a magnum primer is the way to go (if for no other reason than that the manual, Modern Reloading
, doesn't list it in the data). I'm also thinking that the data is for .223 pressure levels not 5.56, and the case is mega-full with 26 gr. 2230. I think I need a different recipe utilizing a different powder. Does anyone have such a recipe, and if possible a source from which the data came, for an M193 clone?