I have an NAA .22 and you would be better throwing it at the bear rather than trying to shoot it. Mine fits in a decorative belt buckle and it’s for show more than anything else.
At the ranges this bear was at. A 22 mini mag was capable of killing the bear.
I have ran a fair number of round through a NAA mini revolver.
No not the best for sure but at the range of a few feet. Placing the round into the side of the bears head is doable.
Having shot bears with rifles, shotguns and a couple different calibers of handguns.
I prefer something with a bit more power.
When I am in the BWCA a Titanium 41mag is the handgun of choice.