Id suggest you find a handgun that is in a caliber your comfortable shooting.
In a affordable caliber.
In a handgun your comfortable shooting. (Tweak by replacement sights and grips)
6 boxes of .454 practice cartridges can cost a bundle. Unless you handload.
Yes I know you can shoot .45 Colt in a .454, but thats not the point.
You have to practice with what you are going to use when you need it for protection.
If your going to mess round with reduced recoil rounds you might as well be using a .22 rimfire for practice.
One thing only lightly touched upon.
Shooting a handgun under stress.
Yes you can buy the most powerfull handgun in the land, Butt add some Buck fever type stress and bad weather or funky venue (willows or a parking lot) could spell disaster.
Nothing like missing a moving bear as the distance quickly deminishes with each bound.
Just as it reaches you, you find your out of ammo.
Find a effective but shootable firearm.
Shootable means one you can comfortably hit your target with.
Not struggle to hit the bulls eye at 20 paces on a nice day in Soldotna.
What about the dusk as your thinking of whats for supper with the wind in your face on a wooded riverbank trail?
The only corrosive Environment Id encountered is the Alaskan Coastal salt air.
You keep your firearm clean and oiled.
I usually just wipe the exteriour of my firearms with some boiled linseed (Flax) oil and cut with a bit of turpentine and let it cure.
Easy to retouch with more linseed and easily removeable with solvent if you want to sell it off in the future.
Linseed oil is what is used inside the steel tube fuselage aircraft (super cub) to stave off corrosion inside the steel tubeing.
If linseed oil is good enuf as a corrosion inhibiter on the inside of steel tubeing, it should be a pretty fair coating on the outside.
Just keep a mayonaise jar of oil handy for touchups.
I like the turpentine smell.
Bears get a wiff of turpentine and linseed oil they know the gig's up.
The Michael Dukes show podcasts, Firearms Fridays (see facebook on the show)
At the 43 min mark Fred from RI asks the question about what Alaskans carry.
https://soundcloud.com/themichaeldukesshow/firearms-frioay-11-8-19-2a-headlines-gun-qa-willie-waffle