I've looked at some charts on the net with no good answers to this. IS a 90 gr bullit a bad weight to shoot from a 1:10 twist in a 270. I loaded up some 90 gr bullits but something bad seems to happen after 300yds. I ahve good consitant sub MOA goups to 300 then they open up. I could just need more gun time, but I was wandering if it could be this combo. I chose a 90 rg varmint bullit to shoot this summer as I only have 1 place to hunt where I can safly shoot over 400yds ( evan at that I think I only have about 200 yds worth of useful energy). I wanted a bullit the comes apart on impact for these quarters.