yeah, i hate to say it but i agree with the others. and Im getting insane accuracy. although my velocities are no better than 223 AI or even just 223. my 88gr Eldm are at 2750fps out of a 26" tube. I dont know enough about barrel making/metallurgy but it seems like barrels are made for the operating range of a 223/5.56. Im so close to the next node but its just too much pressure.Maybe 223 AI or something like that is the way then...
edit: 80.5 full bores and 88 eldm both shoot amazing from 2700-2750, makes me want to try the 95gr smk in that range. but nows not the time for experiments. also I think ive shot 500 rounds of testing (ish) but that was more for myself than it was to develop the perfect load.