i have been loading cast bullets in my marlin 1895 cowboy 4570, accurate mold 46-430 vg, i use lee dies and i get a bulge in my loaded rounds , at the base of the bullets, some times it is all around the case and sometimes it is more on one side. sized bullets is .459, is it the dies is sizing the cases too small for the bullets or is it the seating stem not the right shape for nose of bullets, or is it a little of both?
Would the RCBS cowboy dies help cure this problem?
Newfie