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Old 30th September 2016, 10:01 PM
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Tench Tench is offline
WHFTA World Champion 2016.
Join Date: Sep 2009
Location: derby
Posts: 1,432

As Tugg points out, often the barrel is shorter than the distance a full turn would take so for example a 14" long barrel with a 16" twist would have to be measured over half a rotation and doubled.
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