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Why 1:7 twist for .244 Valkyrie?

why in the world are the .224 Valkyrie barrels 1:7 twist when years of competitors know that you can’t stabilize a 90 gr smk properly with less than a 1:6.5 twist?
 
I had excellent results with a Krieger 1-7tw on a M700 in 223AI several years ago. It was finished at 26", and shot several 1/2 MOA groups at 1000yds. OTOH, the last 1-6.5tw bbl I had on an AR15 match rifle blew-up just about every bullet I tried in it, including S77MKs. If it really does take a 1-6tw bbl to stabilize Sierra's new 95gr MK, I'll pass...
 

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