There is not much difference in the two especially when using bullets 180gr and lighter. The Larger bullets take up more case capacity on the WSM because the COL is limited to the magazine length. The short, fat, beltlessdesign added to the shorter stiffer action will give slightly better accuracy. My Ruger 300 WSM will shoot .5-.6" groups with my hand loads in 150gr, 165gr, and 180gr bullets.