I have a DPMS LR-308. It shoots 1/2 MOA with 168 SMKs, 175 SMKs, 178 A max. It's a stock barrel which is a heavy 24", 1:10 twist. My 175 SMK load is basically a M-118LR dup, but with Lapua brass and WLR primer. It chronys at 2584 and stays supersonic to about 1100 yds (depending on...