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" Antique paper shells maybe but not a modern plastic one."
Oh yes they can.
This is called "Shotshell compression".
I seems to happen in extended shotgun magazines, especially when in a patrol car upright shotgun lock.
Possible contributors may be patrol cars with worn shocks and in hot conditions.
I once loaded a Remington 870 with a factory extension with Federal #1 buckshot plastic shells.
After 30 days when I was checking the gun I found the shells had developed bulges in the plastic between the shot and the shell head.
The bulges weren't yet bad enough to cause failures to chamber, but I've heard of cases where there were failures.
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