I would go with 28-30 inches if you can handle that length. The WSM's and RUM's need longer barrel lenghts to burn the powder properly.
I am shooting 200 grain bullets at around 2900fps out of a 28" Kreiger in my 300WSM, if your really going for that long shot those extra inches can help out! If not a 24" will do fine to a 1000yds!
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