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#9
01-02-2006, 09:15 AM
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Total length. The shape of the bullet (including the amount of bore-riding surface) does have an effect, but the Greehnill formulas doen't take it into account.
Without getting too technical, it's actually the distance between the center of mass and the center of aerodynamic pressure that controls stability - or the lack of it. The longer and "pointier" the bullet, the farther apart those two centers are, and the faster you have to spin it to keep it stable.
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