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Thread: Copper bullets

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  1. 12-04-2013, 03:36 PM #1
    Toby
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    6.5's have good SD aye?
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  2. 12-04-2013, 03:42 PM #2
    gimp
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    Quote Originally Posted by Toby View Post
    6.5's have good SD aye?
    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
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  3. 12-04-2013, 03:48 PM #3
    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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