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When I mail order my model perfect revolver - 357 mag from Herters (It looked like the Hawes) I also ordered a set of model perfect dies with it.
Every load the bullet caused the case to bulge on one side. It did not matter the manufacturer of the brass. Every load was that way. I later sold it to a fellow Marine, I think in 1971. I bought a Model 28 S&W in 357 and along with it new dies from RCBS.
The cases no longer bulged on one side.
The cause, I believe was the model perfect dies were sizing the cases more than needed. When the bullets were pushed into the case the weakest side of the case bulged. The newer RCBS dies did not. The cases were the same though.
This may not be the 'case' with your bulged cases, since it sounds like it had to do with the crimping. What I do not understand though is why all your loads were coming out that way. If were just cases, I think things would vary from case to case. (No pun intended.)
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