Win7stw,
That sounds like one whale of a nice rifle. If you ever want to trade it off, PM me and I will start tossing trade bait ideas at you. I like your taste in rifle calibers. If I was going to practice enough to be competent past where I can shoot with the 257WBY's reach, a 7STW would be on my very short list of calibers to seriously consider. One of my favorite 7's for sure, and a hair faster than even my much loved 7mm Mashburn Super (my last fast 7.... so far!
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Good luck with your 257WBY build. I think you will enjoy the rifle quite a lot.