Yo,
@Bcwitt: This is
actual Science. Reporting results of an experiment against an hypothesis, to wit: "Do Glocks cause Glock Bulge ?"
Experimental report: I recently measured concentricity of a few cases from my G22G4 and G27G4. 0.002" difference min-to-max.
The results from this experiment indicate that G4s do not cause "Glock Bulge".
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I "hoover" brass from an outdoor range. Some of us come from poor families. Occasionally, I find "guppy belly" brass. I have passed it through a "bulge buster" - it looks OK, but I don't trust it. That brass has been work-hardened. Crystalized. It's not worth the effort to collect it - (oh! a .40SW! I'll bag it!) Better to let the brass recyclers make it into a new case. Annealing covers a host of errors.