Hi I am loading 50 AE on the 550B.I am using new brass & speer 300gr bullits with IMR 4227 powder.

Upon seating of the bullit very often I am getting creases on one side of the finished product,sometimes a full ring.

I am trying to keep the bullit as straight as possible as well as making the bell a little larger for an easer fit of the bullit.

Any ideas ?