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So we were at the range on Wednesday with one of our friends. We have had him out enough times he does not need supervising. So he was shooting Jen's XD40 and I noticed him clearing two jams in a row. The seemed a little funny and did not eject quite right so I stepped over and picked up the casing that on the bench. The front half was blown out to a lager diameter. Sure enough, I had handed him one box of 40 and a box of 9 and like a trusting shooter that things I know what I am doing he loaded the 40 cal up with 9mm. oops. Barrel seemed fine though.
This is the first time we have had two guns close enough that it was even possible to make that mistake.