How many charging WY/MT/ID grizzlies have you seen stopped with a handgun? Just curious.
Zero
Neighbor stopped one with a 41 mag. The other folks I know used a rifle. Still other folks never got a shot off - it happened so quick. Some never cleared leather.
You can carry your 9. I got my education from John Linebaugh. I'll go with his results of the heaviest bullet at 12-1250 fps