Re: Best out of the box accuracy???
Without knowing your current capability and experience, it's hard to say.
If you're starting out, I would consider a .300WM to be a whole lotta gun for a beginner, and not be bashfull about trying to convince you to turn down the wick a bit until the demonstrated need for something like the .300WM arises without any question. if your progess is still at teh initial stage, honestly, I'd rather suggest a Savage 10FCP .223, and a very basic Savage MKII .22lr. Economical, uncomplicated, inherently accurate, and very much more conducive to longer practice and training sessions that's something that's as much of a Kaboomenwhacker as a .300WM.
If, on the other hand, you're an old hand at rifle marksmanship, and your needs require a reach that well exceeds 1000yd, I'd go for the mag alright, but I'd rather go 7mm than .30cal, and suggest something in a 7mm Rem Mag. I'd like to recommend a Savage, but a quick review of their offerings shows 7mm RM in sporter barrels, but not in a varmint weight barrel, and I'd much rather see that for the 7mm RM I'd be suggesting. To me, it would be worth investing in an aftermarket barrel to achieve that end.
Greg