Me, I qualified on the 1911 for the first 3 years I was in the Corps before they switched to 9mm. I would just holster that thing and carry it
Seriously,
I currently carry a S&W +p .38 hammer-less concealed.
I don't know about taking down a Grizzly
But my money would be on a revolver. Preferably hammer-less along the lines of .38 +p or .357 with hollow points.
As far as groupings under pressure, the .38 +p would be the better bet. Still gives you the power approaching .357 (but not quite) without the recoil associated
with short barrel .357's .
Springfield and Ruger make some really nice sub-compact .40 semi-autos. I forget the model of the Ruger, but it comes with a couple of frames to change from standard to compact etc.
Cool idea, but I like the simplicity of the revolver and being able to stuff it in my pocket.
My 2 cents.
*edit someone beat me to the .40 lol