270 in a 130 grain bullet, whether it a regular or WSM, would hate to wager on the difference performance wise. I know the muzzle velocity on WSM is about 200 fps higher and shoots maybe a quarter inch flatter if zero at 200 yards, but just not enough difference at most reasonable shots that might be within 300 yards. Dang lethal rounds.
Cost and availability of ammunition is a factor though. 270 wins in that regard.
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