I built a dpms lr308 and went with a jp 18" 1:10 barrel I have not done too much shooting with it yet probably 200 rounds but can't seem to get the great results others are getting with factory dpms barrels. I started reloading and found my max oal for my pmags to be around 2.81". So far I have tested smk 175 over varget my jump at mag length is .116" from reading the reloading articles seems jump shoul be .03" off lands to .015 into lands. My best groups so far are hovering around 1moa usually closer to 1.5. Is my chamber reamed wrong or do I need to keep experimenting? I have also tested hornady super performance 165 and 178 factory and federal gmm 168 and 175 same results. Thanks for any help