There is a thread on ARFCOM where an early gen G20 had a serious KB using DT ammo. Link to thread: http://www.ar15.com/forums/t_1_5/1253136_My_10mm_KaBoom.html&page=1 I can't say what was at fault but looks like some very over pressure rounds + the generous chamber relief on the early G20s. I have a very early G20 and have never seen a case bulge like this poor guy had even with some hot hand loads I've made (155gr @ 1475 f/s). Food for thought, stop when you see a problem don't keep shooting! Wanna kill these ads? We can help!