Only thing I changed was the nose diameter to .447 instead of bore , this was in front of first driving band. I got some leading at first but started running it with 16-1 hardness and it worked. Got a 4th place at Atturbery 1000 yd. matches last summer. 70 grains , 2ff , .060 poly , seated up to just 3 third driving band very snug fit into rifling