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Thread: Copper bullets

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  1. 12-04-2013, 03:48 PM #1
    Toby
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    Quote Originally Posted by gimp View Post
    It totally depends on the projectile.

    High SD just means the projectile is heavy for calibre. 140gr 6.5mm has a good SD, so does 80gr .224", 115gr 6mm, 150gr .277", 180gr 7mm, 230gr .300", 300gr .338" etc.

    85gr 6.5mm has a terrible SD
    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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