Well, this is the first I've ever heard of doing something like this. So, I just used the "bullet in the drill backwards" technique, using the appropriate caliber, boat-tail bullet for each of my rifles. I have a variable speed drill, and went nice and slow. I did the 7Mag, 25-06, the .308, and the .22-250. I didn't use, or have for that matter, any lapping compound. Just the backwards bullet. We'll see if that helped at all.
