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Old 02-05-2011 | 05:35 PM
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arcticap
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From: Central Connecticut
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I will guess that the twist rate is 1 in 48".
The land to land bore size should be .54.
The groove to groove bore diameter would be slightly larger based on the depth of the rifling grooves.
The depth of one rifling groove should be doubled to obtain the groove to groove bore diameter.
Last edited by arcticap; 02-05-2011 at 05:37 PM.
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