My post was in reference to the op, but since you asked,Read my post again. I flat out said I'd need to practice with a S&W .500 magnum.
Now, I can shoot my 6" S&W 629-1 (.44 mag) fast enough I occasionally used it for plate shoots only 5 years ago.
I can shoot a .500 S&W half as fast as the 629-1, and about as accurate, too. But, again, I'd need practice, practice, practice with a .500 mag.
I'm much faster, accurate with my early 1990's vintage ParaOrdnance 1911's (P12, P13, and P14) than any revolver. Carried, competed, and used a 1911 since the mid 70s.
Black or grizz with the 10 mm? Was it charging you or did it not see you when you fired?
Not to minimize your kill or skill, but there's a huge difference between killing a bear who doesn't know you're there, and where you can take your time to aim.....and killing a bear that's charging you out of nowhere, intending to kill you, with little or no time to aim for kill zone.
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