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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
SD, or ifSD?
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<blockquote data-quote="Beng" data-source="post: 816785" data-attributes="member: 37512"><p>JE Custom said in a polite manner, that Shooting a Mosin Nagant and worrying about the effects of actual barrel diameter on bullet sd just doesn't fit <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p><p></p><p>A 180gr .311 caliber bullet and a 180gr .308 caliber bullet of similar formfactor</p><p>would have ballistic coefficients of .5 and .51 respectively.</p><p>Launched at 2600 fps in a 10mph 03 o'clock wind you would see a difference in wind drift of 2.5 cm and 6cm in drop [ps: at 1000yards].</p><p>That's insignificant, more important might be to what degree the bullet is damaged when launched in a barrel of wrong diameter.</p><p></p><p>Effects on terminal ballistics are again most propably due to damage to the bullet and not due to a minor changes in sd.</p><p>The bullets construction is much more important than initial sd anyway.</p><p>That determines the bullet's ability to change sd inside the target medium.</p></blockquote><p></p>
[QUOTE="Beng, post: 816785, member: 37512"] JE Custom said in a polite manner, that Shooting a Mosin Nagant and worrying about the effects of actual barrel diameter on bullet sd just doesn't fit ;) A 180gr .311 caliber bullet and a 180gr .308 caliber bullet of similar formfactor would have ballistic coefficients of .5 and .51 respectively. Launched at 2600 fps in a 10mph 03 o'clock wind you would see a difference in wind drift of 2.5 cm and 6cm in drop [ps: at 1000yards]. That's insignificant, more important might be to what degree the bullet is damaged when launched in a barrel of wrong diameter. Effects on terminal ballistics are again most propably due to damage to the bullet and not due to a minor changes in sd. The bullets construction is much more important than initial sd anyway. That determines the bullet's ability to change sd inside the target medium. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
SD, or ifSD?
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