Well, let's consider these questions: so this rifle will be used for north america from whitetails in the brush, elk, sheep in the mountains, to moose and the big bears. So what caliber and weight do we want to end up with? I'm thinking a 8 1/2# .300 Win. Mag. might do well with a barrel contour similar to the standard weight barrel (.600" at the muzzle). Any other votes for the .300 as caliber of choice?