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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
sectional density question...soild vs jacketed
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<blockquote data-quote="Eaglet" data-source="post: 447037" data-attributes="member: 3756"><p>You may calculate the SD (Sectional Density) of any bullet by dividing the weight of the bullet (in pounds) by the square of its diameter.</p><p></p><p>Example: a 30 caliber bullet of 180 gr.</p><p></p><p>Weight in lbs = 180/7000 = 0.0025714 lbs.</p><p></p><p>Square of its diameter = 0.308X0.308 = 0.9486</p><p></p><p>SD = 0.0025714/0.9486 = 0.271</p><p></p><p>As stated above, if the diameter and the weight are the same the SD is the same.</p><p></p><p>SD is important because it has a significant effect on penetration. The higher the SD the better the bullet will penetrate assuming equal things like bullet design, materials, impact velocity etc.</p><p></p><p>A 180 gr. 0.308 bullet will have better penetration than a 180 gr. 0.338 bullet. ( assuming many things being equal like design, impact velocity etc.)</p><p></p><p>SD for the 180 gr. 0.338 would be: 0.225</p><p></p><p>I hope that helps on getting a better understanding of SD.</p></blockquote><p></p>
[QUOTE="Eaglet, post: 447037, member: 3756"] You may calculate the SD (Sectional Density) of any bullet by dividing the weight of the bullet (in pounds) by the square of its diameter. Example: a 30 caliber bullet of 180 gr. Weight in lbs = 180/7000 = 0.0025714 lbs. Square of its diameter = 0.308X0.308 = 0.9486 SD = 0.0025714/0.9486 = 0.271 As stated above, if the diameter and the weight are the same the SD is the same. SD is important because it has a significant effect on penetration. The higher the SD the better the bullet will penetrate assuming equal things like bullet design, materials, impact velocity etc. A 180 gr. 0.308 bullet will have better penetration than a 180 gr. 0.338 bullet. ( assuming many things being equal like design, impact velocity etc.) SD for the 180 gr. 0.338 would be: 0.225 I hope that helps on getting a better understanding of SD. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
sectional density question...soild vs jacketed
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