Very interesting & well done Review.I do.
We are starting to see the evidence ...that stopping these bears is all about using Quality penetrating ammo; Hard cast or solid penetrators that function well in your specific gun. In fact,I think the Ammo matters more than the caliber. Sure bigger is better but fast accurate shooting trumps everything.
Plus, the mounties in the far north that have to deal with the most dangerous Polar bears are issued a 10mm.
Testing is important. Some have problems with the 220g tumbling. Some modify their G20's and have FTF problems. My stock G20 functions perfectly with 200g hard cast in both Underwood and Double Tap.
I'm going to put this here. Sig came out with their 10mm built on their 320 platform which is a darn good option for someone that prefers a smaller grip and a little better trigger than the stock Glocks.
This is a tad long, but a good honest comparison mostly on the Sig X10