An older relative of mine years ago commented on bulges in the barrels on 22's.
Seemed in those days (probably just before/after ww2 at a guess) a lot were done shooting fish for the table, the bulge occurring right on the mark where the barrel came out of the water.
He then proceeded to tell me that the best way was to submerge the whole gun underwater hand and all before you pulled the trigger.
I have a bit of mythbuster in me but never been game to try it.
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