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257 WBY Mag and N570

Iron Worker

Well-Known Member
Joined
Apr 3, 2004
Messages
2,659
Location
Reno Nevada
I'm loving this N570 powder. 73.2 grs behind 115, Berger is averaging 3.326 with an SD of 5.1 and an Extreme spread of 14.2. All out of 26"Bartlein bbl. Shot these in 50-degree weather, with zero pressure signs. I wonder how they would do in 80-degree weather?
 
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