What's the most powerful firearm you've ever fired?

It's a tie for me, between a .500 S&W Magnum and a Barret 82A1 .50 caliber. The .500 cartridge puts the .44 cartridge to shame.

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bowman81 · M

M-79 and M-203 grenade launchers.
Most fun was the M-60 but it was just a 7.62mm, a whole lot of them in a hurry.
Most powerful civilian rifle was a .378
Weatherby Magnum.

Fretnought

@bowman81 I have an M-14 that I'm not supposed to have. 😆