I don't think it does. There is a .308 version of that rifle, and I have never seen 5R listed for it either. I do have the other version of the HS .308 with fluted/muzzle threaded/5R barrel. I would be willing to bet if it did have 5R rifling, they would not leave that out of the product description. That being said, Budsgunshop has all 5 star reviews for the HS 300 Win mag. I really don't know how big a deal 5R is supposed to be. The only thing I have read several times is that they are easier to clean. Supposedly, they don't copper foul as bad. I have no idea if that is true or not.
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