Would be sticking to the 300 if I was you
It will get to 800 with out to many problems, the 7mm variant, whilst it is slightly better on paper, really its f all difference in real world, just a couple less clicks of the scope and a shit load more time and money involved.
If the barrel doesnt shoot good enough for long range work then I would sell it and buy a long action to build off, or better yet just buy a tikka 7mmrem mag
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