i use them for my auto pistol loads and use one for my AR loads i pulled some heads and found a slight ring around some of them which got me to think about buying a f/l bushing sizer die and use a smaller neck bushing for instance i mic'd a winchester case .011 so if i took .011+.011+.224=.246 subtract .001 leaves me with a bushing size of .245 now what i'm thing of is subtracting another .001 for a final bushing size of .244 since the whole neck will be sized the bullet should have better holding force.