the twist rate in terms of the 'travel' (length) required to complete one full revolution of the projectile in the rifled barrel. This method does not provide a straightforward understanding of whether a twist rate is relatively slow or fast when comparing bores of different diameters.

The second method describes the 'rifled travel' required to complete one full projectile revolution in calibers or bore diameters:

where is the twist rate expressed in bore diameters; is the twist length required to complete one full projectile

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