As far as the Tikka. Mine (in 30-06) has become my favorite rifle. I've owned Ruger 77s and although they are good rifles, the action of the Tikka is much slicker. The 300 win mag is a lot of cartridge for what you're hunting. And unless you plan on going after bigger game someday I'd say why not go down in caliber. I hear good things about the 270 WSM and of course the 270 Win is a proven game getter.