I can't give a complete answer to your questions from memory, but the entire savage series has a stronger core than the show time series. I know that the cores have the same shape; however, the savages have a significantly higher differential. You will see the same shape core in the jungle green too, and I beleive it is a savage core. It seems to me that the rg is 2.50 and the diff is 0.055. And I think, could be wrong here, but it seems to me that the Storm X-factor is using the same 2.50 and 0.55, although that core is a different construction also. I don't recall the V2 specs.
One of my friends has had the Savage Sanded since it came out, and he still uses it regularly.
hope this helps.
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OnlyBowling
