Use zero for the barrel taper and see what you come up with. By going that route, if you decide to use a bull barrel in the future, you won't need to upgrade the mounts. There isn't a lot of taper on the PH from the barrel nut to the objective location.
Or you can go this route- The action diameter is 1.350", and the barrel at the barrel nut is 1.065" - use 7mm (1.350-1.065=.285)for taper and see what that works out as far as ring height.....I think you'll be fine with medium rings.
All of mine are running 50mm objectives with EGW rails in either 0 moa or 20 moa and all of them have Burris XTR medium rings with no clearance issues even with bull barrels.
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