Load is as follows:
Cast Performance 405gr WFNGC
New Winchester brass trimmed to length
47gr H4198 (1gr above min according to Cast Performance)
Fired out of a Marlin GG
Where the head case meets the body is a bulge on every peice of fired brass (12 so far). It's not a consistant bulge around the case but more so half of the diameter which measures out to .510", new brass measures .500". Is it typical to see a bulge in the brass with a stout 45/70 load out of a GG? Can anyone explain this to me?
The left peice is new unfired brass and the right is a fired piece with the load above.