Had a similar problem but not as lucky/smart!
I had been shooting the 17 Mach2 in a semi-auto for a while and knew about the problems with the Mach2 rounds in these semi's. I wasn't thinking (seems easier these days) and had a funny sounding round fire and eject. I just went and fired the next round without thinking and that one really went kaboom. The fired case was actually ejected (as parts) and I finally decided (DUH!) to check the bore. The bore was clear of any bullets but sure enough it had the tell-tail shadow of a ring about 6" out from the chamber. Lucky for me it was a barrel I had relined from 22lr but it was still very annoying since I had to reline it all over again. I heated the barrel for about an hour at 350 degrees and pulled the liner out in one piece -- sure enough there was the nasty bulge with cracks in the liner. I kept the liner as a reminder that I need to pay attention to what the heck is going on around me.
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