6.5's have good SD aye?
6.5's have good SD aye?
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How do you work it out, weight and something to do with the width. I'll gogole it its been ages since I read about it
Here.
Sectional density (SD) is the numerical result of a calculation that compares a bullet's weight to its diameter. To calculate a bullet's sectional density divide the bullet's weight (in pounds) by its diameter (in inches), squared. The higher the SD number the better the SD and the heavier a bullet is in proportion to its diameter.
Last edited by Toby; 12-04-2013 at 03:50 PM. Reason: Edit: adding info
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