A 300wm should have the same bolt face as a 7mm rem mag, if I'm not mistaken. So you could just swap barrels and not change the bolt head. And if you want closer to the lapua you could do a 338 edge and still not change the bolt head, just the barrel. But unless you buy a dedicated 338 lapua action, it will be a single shot with either an edge or lapua, without some machining and most guys here won't recommend a lapua on a standard action.
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