There laminate stock is the best they have. They do make a few rifles with HS precision or McMillan stocks but not in the caliber you want. And, it would be cheaper to buy one with the tupperware stock and replace with a Bell & Carlson or HS precision.
Without turning it into a project. I would buy a 12 Varminter Low Profile in 300 WSM
(they don't make it in 300 WM). You will be fine with the short mag out to 600. The gun cost about $750.
Other options would be to buy and restock. Or, call savage and ask how much to build you a 300 WM with a HS Precision or McMillan (I don't think they do not make the laminate for long action). This is not worth it in my opinion.
If you really want a 300 WM the wood stock versions are only about $550. I would definitely not use the Tupperware synthetic stock. It Sucks. Bell & Carlson has the DuraMaxx stock for savage long and shot actions it says its drop in, but it needs to be inletted.
I think they only make the 12 BVSS in varmint calibers now.