What I did was to seat the bullet (MGB 124 CMJ) then measure right below the bell. It measured .375 so I set my crimp to .375 which is basically no crimp at all. I have read where most will crimp 38 super to .377 or .378 which would be less than no crimp at all. What would be the reasoning behind using less than no crimp (.377 to .378) than just no crimp (.375) ? Wouldn't the bullet be seated at .375 either way ?
Thanks,
SR