we have a 26 inch 10 twist in a 30-378 245 shoot fantastic @ 3100 an 7 % reduction in g7 bc to 1000yrds the 9 twist should maximize the g7I just ordered my barrel from hart today, 28" 1:9 twist, in a dream world I would like to be 3000 with the 245s but plan on running the Berger 245, 230, 215s and I want to shoot the 245s but if my tube likes one more then the others then I may just run that