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10mm is pretty sweet. I have a glock 20 (gen2?) which I blew the mag catch in half using reloads I bought at the range. Poor chamber support, be careful what you feed your glock!
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I was resizing 10mm cases last night, and among them were cases from Double Tap, purveyors of factory "nuclear" ammo, and those cases, fired in a Glock (characteristic firing pin marks) were quite visibly bulged.
When I've seen bulged cases from a Delta Elite, the bulge is just ahead of the extractor groove where the case is unsupported, but the cases I was handling last night were bulged along the entire lower half, as if the chamber diameter is too large.
I won't be pushing the pressures when reloading these cases!