Minihuntur,
Excellent question and a very dangerous practice, if it is possible! I would suggest all persons follow the manufacturer's suggestions for the proper ammo for any firearm.
Our savvy old timers here, Jack, Catfish and Mr. 16 gauge, have all raised interesting questions. I, personally, do not believe anyone can fire a .45 Colt cartridge in a .410 bore. It may work the other way around because then internal bore dimensions would be more in the shooter's favor.
Adam
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Adam Helmer
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