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In 24", you'll be hard pressed to get 180s past 2950 with maximum loads. The 12" twist was in the early 300s because it was designed around the 150gr bullet @ 3400+. I would shoot the 165 premium that grouped the best and you might get to 3050fps. My LH 7mmWBY loved Hornadys - when I got mine in 1970, Hornady and Nosler bullets were in factory loads.
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