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Old 08-24-2012, 02:37 PM
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Lost Lake Lost Lake is offline
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Using that twist rate calculator, I can see where the optimum twist rate for rounds between 800 and 1200 fps in 9mm size could vary between 1:17 and 1:21.

Not that 'optimum' twist rate will be any better than standard, but there could be some leeway, especially if you are getting some really hot loads or are shooting very slow loads.
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