While not an Alaskan I've hunted the Great Land.  As a hunter first and secondly a rifle/cartridge nut, picking 1 cartridge for AK is easy.  Hands down the 300 Winchester Mag.  Especially if one does not reload!  Lots of ammo available and still priced affordable.  For the big boys find a good bullet 180 grain load your rifle likes.  For mountain game try Hornady Superformance 150 GMX at some 3400 fps!  For little critters standard 150 gr loads.  Ideal?  Perhaps not.  But heck, the AK Dept of Game actually reccomends the 30-06 for brownies... Really... Scary?  Power, range, versatility, availability.  It would not surprise me if the 300 Winny is the most popular in AK.