Arisaka action test

[Griff Murphey]

not so sure about this . I was going to prep some brass and order some 311 bullets and see how she did . But when I went to resize the brass it was a bear to get the die all the way down . Even then it left a significant bulge at the base of the case . I'm not sure if this is something to worry about or not . If the case is completely supported , why would it bulge ?
Kenneth

Assuming you are using fired cases from your rifle, could your chamber be oversize? Maybe you could just neck size them?
A high school ROTC classmate had at least two 7.7's that he had reamed to .30'06 so he could fire USGI blanks out of them. Could your rifle have been "reamed out?"