Just bought a ruger Alaskan and some rcbs dies. Cast up some 454-308 boolits, powder coated and some ran some thru the sizer. Sized both to .454 slugged my bore it was .453. Now to the loading I been loading these in new star line nickel brass. I ran the brass thru the sizing die then thru the expander die boolits fit bout half way in on driving band. Now when I seat the boolits they will cut a ring of lead off. I thought maybe it was my 454 seater die taking the bell off. I thought I would try my 45 colt dies because they have a larger ID then the .454 did not work same ring of lead. This happened on both powder coated and lubed boolits. I also tried using lee expander die but no help. I know I'm doing something but can't figure it out any help would be appreciated. David