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Firing a .40 out of a .45 when you're shooting both on the same day is even easier because the cartridge size is a lot closer to the .45. The round does fire but the empty space around the projectile and shell is enough to drop the pressure to the point where the projectile leaves the barrel but the shell doesn't eject. The difference from normal is highly noticeable.

Don't ask me how I know this or Joe817 may never want to be on the same range as I am.