I've shot about 20,000 rounds of my reloads through my G21; have yet to see a bulged case. I also shoot a bunch of .400 Cor-Bon through an Accu-Match barrel. Again, no bulges. Most of the bulged cases are with .40 Glocks. I personally would not reload for .40 Glocks.
I've reloaded .45 (which is half the pressure of the .40), until the cases split, with no problems. I did have a Kb, but that was related to a bullet setback with .400 Cor-Bon.
[This message has been edited by WalterGAII (edited November 08, 1999).]
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