Hrm... I'm not sure which is the least powerful. It's either a .38 S&W (the weaker brother of the .38 Special) or the 7.62x38r Nagant. As for most powerful, that would be the .45 ACP. I just realized that both my revolvers, a platform reknowned for it's ability to be chambered in more powerful cartridges than Automatics, are weaker than any of my autos.
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