I have a 22-250 barrel that with a 55 grain bullet shoots about an inch at 100 yards. That part of the story is great. It also shots about the same with 45 grain bullets. The problem is with 62 grain bullets. I tried 2 kinds of powder, 4350 and 4064. With both of these at or about the starting load the bullet key holes. The bullet is a 62 grain boat tail hollow point. The same bullet in a 223 AR with shoot under one inch. The AR has a 1 in 9 twist and the 22-250 has a 1 in 14 twist. I thought that might be what the problem is but after looking at my loading book I am not so sure. When I looked in the book under test specifications, it showed the barrel they used (universal receiver) to have a 1 in 14 twist. Now, if a 62 grain bullet worked with the barrel they used, why does it not work with the 22-250 barrel I have?