“The Glock 20 10mm is the go-to pistol in Alaska today for bear defense.”
Only by some.
The Norwegians issue Glock 20s in 10mm specifically for polar bear defence and it has a proven track record with the Norwegian Artic forces in actual polar bear shootings. Good enough for the world’s apex land predator good enough for anything else that walks on land.
I own three 10mm two Glocks and a stainless EAA. I routinely go to Montana , Alaska and Idaho for geology reasons all of which have brownies and Alaska has polars . 220gr hard cast hand loaded to primer denting pressures yields crimp verified ~1400 fps in a compensated 6” barrel with a 28lb aftermarket spring. That’s 15+1 of real deal 44 mag energy , bullet weight and velocity. My model 29 Smith 6” shoots 240gr jsp at a crimp checked 1350 fps and 220 gr Barnes XTPs at 1450’
I’m not afraid to hand load to these levels in a fully supported lone wolf stainless barrel.