300wm is a great caliber as far as upgrades if i was you i would do as money allows

can go wrong with a leupold scope
rifle basix trigger 140ish if budget allows get a jewel 230$
bell and carlson medalist stock 210$ if u can afford it go with a mcmillian i think around 600 fully bedded
decelerator recoil pad really helps with the recoil
match grade barrel if budget allows 315 + chamber and thread 150ish depends on smith

then you would have a real shooter :) my bell and carlson we never had to bed it shot great groups unbedded so we left it