Handgun caliber question

[CMF]

Now Alaska, that is a different world. Sorry that 9mm is not going into the skull of a brownie.

Looks like it did in this video. 10 looks better, but 9 penetrated.
I'm not saying I'm set on a 9. I plan to try out a 10 before I go to AK.

 

[Snowwolfe]

It is pretty easy to steer penetration tests one way or the other simply by using a different brand of bullet or changing the velocity.