I have an Alaskan in .480 Ruger. It weighs 42.8 oz (unloaded) on my digital food scale. Add 6 rounds of 400gr ammo and it goes 50.2 oz. It looks bulky and awkward but is well balanced and amazingly easy to shoot. You obviously loose some velocity with the 2 1/2" bbl, but a 400gr bullet at 1,050 fps is is a very capable load for anything you may encounter in the L48 and probably in Alaska.
Up close and personal it is quite practical for personal protection against large animals -- just my opinion of course. Most will never need it or use it for that application. Of course need almost never enters into the purchase equasion at least for me.
Was always curious with the concept and justified mine with the thought of using it as backup when bow hunting elk in grizzly country. I've had fun doing load development and plinking (yes plinking) with this big bore belly gun. The .44 or .454 might be a better choice for those that live in the L48.
FWIW,
Paul