If you want anything that has a magnum bolt face, you will want to start with a rifle that started with a magnum bolt face. Reason is that the lugs on the magnum bolt heads are thicker and use a different firing pin assembly and front baffle. So if you bought a standard (.473") bolt-face rifle (i.e. 308 or 30-06) you would have to change out all of those parts to convert it to a magnum - not to mention the magazine box and follower. Cheaper and easier to just buy a rifle in .300 WSM so all you have to do is change out the barrel.
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