Buffalo bore does make these,
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Personally, I would want a 44 mag or more.
Stopping a charging pissed off grizzly is no small matter .
Do you really think those two would buy that ammo?
I'd bet the ammo was some other low end stuff.
A .45 auto is a very poor choice for a "bear bullet".
Anyone who takes a friggin Taurus 1911 on a bear hunt shows rocket surgeon potential. And you just know they test fired those expensive rounds eleventyhunnert times to check function.
Hey! Them shells cost money!
Long ago I knew a guy who had served on Kodiak Island way back there just after WW2. He told a story about a brown bear that came on them and it took eleven shots from an M1 Garand to kill it.
A .45acp would just piss a bear off.