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Let's try it. A Woodleigh .333 300 gr SP. 1.459". T= (150 x D)/R Where: T- is the twist required (number of inches per one revolution) D- is the diameter of the bullet (in inches) R- is the ratio of bullet length to bullet diameter (length divided by diameter) (150x.333)/(1.459/.333)=11.4" If it is resized to .330 = 49.5/4.4212 = 11.2" assuming no additional length. A .330 250 gr resized to .323" bore: 1.302" 250gr SP .330 = 48.45/4.0310 = 11.24" 1.419" 250gr FMJ .330 = 48.45/4.3932 = 11.03" i.e. for resized to a .323 bore. |