Guys I have been experimenting with some 69gr rounds and RL15. I'm shooting a 16", 1-7 twist, 5.56 chamber, free float AR. I've loaded 23, 23.5, 24, and 24.5g into Federal brass, sized and trimmed with CCI 400 primers. 24 grains got me 2552 fps with about 1" groups. 24.5 got me 2629 fps with...