Hello I just purchased a LAR-8 Rock river 308. I only have like 15 rounds through it. I just bought 50 rounds of New Lapua brass and I reloaded it to the proper specs. I put a few rounds in the mag and dry cycled them, went in fine and came out fine. The question I have is why does the brass and bullet have scuff marks on them. Is it the new chamber or maybe the new lapua brass? My OAL in 2.800 I think thats right for the 308 round. Also the bullets I used are seirra 168grains hollow point BT. Need Help on this issue? Thanks Garret