What is the best barrel twist and powder for shooting a heavier (62-69grn) bullet? I shoot 3 gun so targets are 5ft-550yds. My current barrel is a Yankee Hill 16" 1/9 twist. Charge has always been been my powder cause I know it works. My current load is 55grn V-max with 25grn Charge, CII sr primers COL is 2.220. It shoots very tight out to 250yds then starts to drift. I want to go heavier so I dont have as much drift and more retained energy.