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I was told a 1:13 twist .300 Win Mag barrel would not shoot 180-gr. boattail bullets smaller than 2 foot groups at 600 or 3 foot ones at 1000 yards when I had it built as a longer range hunting rifle. Sierra's 180's went into 1 MOA at both ranges when checking it out. JBM's calculations put those bullets at 1.485 stability factor; at the low end but good enough.
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