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7 WSM would be another option, but necks are short. I heard that .300 SAUM was back on the market, so it could easily be necked down to 7 SAUM – perhaps neck turning too.
Or just get a good brake fitted to your current rifle. I have a Long Rifles Inc brake on my .300 Win Mag that reduces recoil to around .308 levels. Terminator Products T2 and T3 are also very good.
http://www.shoot-long.com/products/long-range-accessories/terminator-muzzle-brakes/
Would be a much cheaper option than switching chambering and re-barreling.
