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Let's Do the Twist!
A Guide to Calculating the Ideal Bullet Length
[A handy formula discovered on the Internet by Keith
Dale]
Here is a handy formula for calculating ideal bullet length:
L = 150 x CAL x CAL / T
..where L is length of bullet in inches, CAL is calibre in decimals of an inch and T is rate of twist of the rifling in inches.
* Note that this formula becomes less accurate at the larger calibres used in black powder firearms
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