A bit more info for you.
Get a 26" pipe on the 257 WTBY, that's where it shines, long pipes.(factroy #'s developed from 26" bbl)
As for the 270WSM, own one my self. Only trouble I see in your rifle choices is
A. The Browning has a 23" barrel, so dont exprect factory type numbers in the shorter tube.(24" factory #'s)
B. The WSM's in the Rugers are no longer being made, (Ruger will not pay the Jamison royalty)unless you have one tied to a tree someplace expect to have it a mighty tough find.
As for the merits of each caliber, they are both great, WSM ammo is a bit more easily found, and a touch lighter on the wallet, but if you reload I see narey a fly on either of them.
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There are no absolutes
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