I know one shooter who loves to load 185gr lead bullets in a .45, and he has ruined THREE BARRELS in club competition, one of which I observed personally. He fired a squib, and with five people screaming STOP! STOP! at him, racked the slide and fired another shot, bulging and locking the barrel.
You can't always depend on the "won't chamber another round."
And the squibs I have personally seen in a revolver locked the cylinder because the bullet stopped partially in the barrel and still just barely in the cylinder. Can't count on that, either.

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Science plus Art