Well lets look at your choices
So here are the rounds iamb considering that are available or that iamb seriously considering, and though I know some of them are Griz-worthy, I'd like a comparison.
338 Win Mag (BAR)
35 Whelen (Remington 7600)
444 Marlin (Levergun or Saiga conversion)
450 Marlin (Levergun or auto conversion)
458 SOCOM Monster (AR-15 conversion)
50 Beowulf (AR-15 or AKM Conversion)
1. First most interior grizz probably can be taken with any of these calibers
Costal Brownies may be another story due to bullets and loads.But both deserve your upmost respect.
2. Lever actions and pumps are good choices and the 444 ok if used by experienced big game hunter with Buffalo Bore Ammo or equal hand loads with a good 300gr bullet.
Also a lever action can be loaded while having a round under the hammer and not worrying about dropping a clip as with some pumps ,autos.But some people carry spare ammo in just there pocket with other things
and when in a panicked hurry i have seen a tube of chapstick stuffed in a magazine on a marlin 1895 45-70 levergun after 4 rounds into a bear luck
prevailed and the bear was dead in the alders and there was still one round in the chamber which actually was a good thing even though client didnt know the bear was dead he had presence of mind to load his gun
instead of chasing bear into alders even though he did stick a tube of chapstick in the magazine .He did learn from this experience and i bet he
doesnt carry anything else but ammo in his ammo compartment
black nylon elastic ( on rear stock) or jacket pocket.
Belive it or not but this was not the first time or the last i seen this type of mistake occur.
3.Autos are a risk as a dangerous game rifles especially in a harsh climate
as we have with sideways rain and all the other stuff it carries into the action Such as spruce needles ,alder seeds and devils club and mud.Enough to foul up any auto loader and some other types of actions.
But if the auto were to be used go with the browning in 338 WITH A GOOD 250 GR BULLET.
4.IF hunting in Alaska and Your from out of state you are going to have to use a guide and he will probably narrow it down to the 338 browning , 35 whelen 7600 or 450 lever as most grizzz/brownies are taken at less than 100 yards and most guides like to get a lot closer than that i always liked less than 50 yards.
5.Some of these Bear hunts amount to no more than a bear dropping in his tracks being taken as he is sleeping or eating and never sees or smells
the hunter.But on the other side of the coin everything can go wrong from
as a thumb stuck in the auto loader ripping the skin off trying to clear a jam, a clip trying to be put in upside down and dropped and the bear has already taken 5 rounds and is still coming after the client tried to hose the bear down with the auto when the bear did not drop after first round .The client still fishing in a panic for a magazine and has no were to go as the bear is coming straight down hill when the guide drops him with 1 well placed 375 HH round out of a model 70 safari grade winchester .
ALWAYS BE familiar WITH YOUR FIREARM AND PRACTICE dont JUST
COUNT ON FIRE POWER AND LOTS OF AMMO.I tend to agree with what
JJ Hack IN THE AFRICAN FORUM says you can be a hunter or a gun collector.
Dont get me wrong theres nothing wrong with a lot of firearms but
you need to become very good with the ones you are going to use
on hunts and the animals you hunt deserve no less than you being a
good humane shot and a woodscraft savy hunter.
Growing up in a Alaska village we usually had just a few rifles and 1 or 2 shotguns and used them for everything we hunted .WE subsisted on wild game and fish and had to hunt or it was a hungry winter.
dabigmoose