[gunnut606]

The .38 is a semi rimmed straight wall case . The 9mm is a tapered rimless case. The 9mm headspaces on the case mouth. The .38 headspaces on the rim.

The idea that the 38 Super headspace on the rim only true anymore if you have a very old barrel, all recently made barrels headspace on the case mouth.

And yes, you can shoot 9mm ammo in 38 Super barrel MOST of the time, if the chamber of your barrel is not extremely match grade tight. BUT you should not do it too often, it will shorten the life of the extractor, because that is what holding the 9mm round in a 38 Super barrel.

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[gunnut606]

This was simply dumb luck and you shouldn't encourage anyone else to try this on their pistols. I accidentally shot a few 9mm rounds from my 38 Super Elite Professional and the slide locked up so badly that I nearly had to send it back to Wilson Combat.

Just curious, what was the cause for the lock up?