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Cartridge Efficiency vs Recoil
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<blockquote data-quote="Carbine Kid" data-source="post: 1314826" data-attributes="member: 59686"><p>G'day MikD31.</p><p>J D Custom gave you some useful figures. however it seemed to me that you were after a way to simply compare recoil figures.</p><p>Here is a simple formulae for "free recoil".</p><p> </p><p>Fr = (Wp + Wb) x Wp divided by 80 x Wr.</p><p> </p><p>Where : Fr = Free recoil in ft/lb</p><p> Wp = Weight of powder " grains</p><p> Wb = Weight of bullet " " </p><p> Wr = Weight of rifle " pounds </p><p> </p><p>An example for a 308.</p><p> </p><p>Fr = (46 + 150) x 46 divided by 80 x 8</p><p> = 196 x 46 " " 640</p><p> = 9016 " " "</p><p> = 14.09 ft/lb</p><p> </p><p>AS you can see changing powder has a bigger effect than changing the bullet weight.</p><p>This is a simple comparator and doesn't account for energy variation between single and double base powders but to get quick comparisons that doesn't matter.</p><p>How does an individual "feel" recoil ? well that is up to him. However you can get accurate "free recoil" comparisons between different rifles and components.</p><p> </p><p>Hope this helps. </p><p>Steve.</p></blockquote><p></p>
[QUOTE="Carbine Kid, post: 1314826, member: 59686"] G'day MikD31. J D Custom gave you some useful figures. however it seemed to me that you were after a way to simply compare recoil figures. Here is a simple formulae for "free recoil". Fr = (Wp + Wb) x Wp divided by 80 x Wr. Where : Fr = Free recoil in ft/lb Wp = Weight of powder " grains Wb = Weight of bullet " " Wr = Weight of rifle " pounds An example for a 308. Fr = (46 + 150) x 46 divided by 80 x 8 = 196 x 46 " " 640 = 9016 " " " = 14.09 ft/lb AS you can see changing powder has a bigger effect than changing the bullet weight. This is a simple comparator and doesn't account for energy variation between single and double base powders but to get quick comparisons that doesn't matter. How does an individual "feel" recoil ? well that is up to him. However you can get accurate "free recoil" comparisons between different rifles and components. Hope this helps. Steve. [/QUOTE]
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