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Originally Posted by Nanuk
You do not need a 40 barrel. just shoot the 40 in the 10mm barrel. It is perfectly safe, in-spite of what the safety Nazi's tell you. Just make sure and clean the barrel after shooting 40's.
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It's safe in terms of not creating a risk of blowing up the gun, but it's not recommended. It means the shorter .40 S&W rounds headspace by the extractor holding the case by the rim, so every shot puts a stress on the extractor hook that it wasn't designed or intended to undergo. It
could result in a broken extractor, and that puts the gun out of commission.
Full disclosure: I have done the same thing, shooting .380 ACP through a .38 Super barrel as part of an experiment. I probably didn't shoot more than five or ten rounds.