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The Hornady 75gr AMax sometimes has a hard time getting stabilized with a 1-9 twist,but the Hornady 75gr BTHP Match bullet shoots very well out of a 1-9 twist barrel.
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Dunno about the 75 gr BTHP, but the 1:9 20" Savage I have won't stabilize either the 75 gr AMax or the 75 gr JLK VLD. The 26" gets enough speed on the bullet that they shoot very well. I might could try hotter loads to get the 20" shooting them, but I have such excellent results with the lighter VMax's I don't see the point.
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Notable exceptions are the 36 and 50gn Varmint Grenades (the AR shoots both of those very well). Shot those so poorly on initial testing that I just gave up half way through load development.
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I just worked up a non-lead squirrel load for my Dad to use when he borrows my 26" 12FVSS. The 50 gr VG's were worthless. The Hornady 35 gr NTX worked up just fine with H322 on an OCW series, 5 shots into .325 MOA at 200 yards. Kind of light, but I think they'll work well. Hornady told me to use 40 gr VMax load data.
Regards,
Brian in CA