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I'm going to have to retract my original assessment.

My calculations show that if you heat the .40 caliber chamber to 2210.7 °F and chill the .45 shell down to -449.7 °F it would drop right in. Of course you would have to fire it within 17 milliseconds as they head toward thermal equilibrium and undergo some nasty distortion.

Now that I think of it that is exactly what you did. Had you fired it within 17 milliseconds, the firing pin strike would have likely shattered the shell to bits. You waited too long and the shell and chamber distorted as they reached thermal equilibrium.

I stand corrected. Those guys are true physicists. So wise guy, you found a way to use up your .45 rounds in your .40cal. Fess up and tell us where you get your liquid helium.

I walk away to go tell my friend I'm ready to go when he is and they think I have left. When I come back into the store, I hear them talking to their buddies about how some guy was shooting both .40's and .45's and he loaded a .45 in his gun and now it's stuck and he messed his gun up but he claims he didn't do it. They don't even see me standing right there so I again tell them that's not what happened and I leave shortly after.

Complete morons. You should have handed them your .40cal gun and a .45cal round and offered them $1000 challenge if they could chamber it - and if they couldn't they would have to resign instantly to never work in the firearms business ever again even unless it is as a live target.

ETA: If you could drive a .45 into your .40 and set it off you would be picking pieces of pistol out of every nook and cranny of your body for a long time.