Yeah I agree that the handgun is probably not necessary, but its an item I want to take anyway. Even if I don't take the 10mm I will take a lighter 357, but for now the 10mm is going to make the weight limit. I could picture myself doing some fishing and leaving the rifle at camp or on the bank and wanting the handgun along then. Also I plan to have the rifle strapped to my pack in the Exo weapon carrier a lot and use 2 trekking poles, so at that time the handgun would be more accessible. I'll also sleep better in the tent with the handgun next to me.
Bear spray is a good idea, I just don't have experience with it. I also know I won't practice with it, and the wind is often wicked on the tundra from my research. The handgun is something I will practice with, and not nearly as susceptible to wind. My thinking is that if I don't have both I won't waste time in a bad situation deciding which to reach for. I'll go for the handgun if the rifle isn't easily accessible because that's what I have and have practiced with. The handgun will be a lot easier to maneuver in a tent also.
There is also the earlier mentioned part where this trip was the excuse to the wife to buy the 10mm. That means I have to take it or hide it, I don't want to explain that one to bad.
I've been practicing a lot with both the hardcast ammo (Underwood 200gr) that proved to hit closest to the sights and be the most accurate, and some cheaper Fiocchi 180gr HP ammo. The Fiocchi is full powered ammo and hits the same as the Underwood, plus it's only a few dollars a box higher than ball ammo when I catch it on sale. Out to 25 yards I shoot it pretty well even when I rush it. Inside 15 I shoot it really well. Past 25 yards I'm better with my 1911 10mm and it's better trigger, but I don't see myself shooting a bear in defense of myself at that range. The Glock is lighter, and seems slightly faster off recoil for follow up shots with it's polymer frame taking a bit of the recoil. I have good aftermarket fiber optic/tritium sights on it and a KKM 6" barrel that works well with hardcast ammo.
I know my practice in the back yard isn't the same as a charging bear at all, but it's better than nothing and is building familiarity with the gun and muscle memory. It's also fun, it gives me a reason to practice more with a handgun than I usually do.
If I get dropped in an area where any bear will be visible for a long time before he gets close to me the handgun can sit in camp. I don't have to pack it, but I want to have the option to at least this first trip.
Thanks guys for the advice, even if I don't take this portion of it. I hope my reasoning makes a little sense.