In answer to your question, NO. My cases do not bulge and I know, as that's one of the first things I check with any autoloader. Also, firing pin indentions in primers are nice and round, not a trough or line caused by premature unlocking of the slide and barrel before the bullet's left the barrel. I use the standard factory spring in the .40, but I do replace my 9mm Hi Power recoil springs with 18.5lb springs. These have caused no problems and I hope, prevent battering. Best.
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