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Hunting
Long Range Hunting & Shooting
bullet energy limit
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<blockquote data-quote="birdiemc" data-source="post: 1787476" data-attributes="member: 29632"><p>Kinetic energy is physics </p><p>ke=.5 x mass x velocity squared.</p><p>For shooting we have to add in the acceleration due to gravity to convert from weight to mass and convert from grains to pounds so the formula becomes </p><p>Ke= grains x velocity squared/ 2 x 7000 x 34.17</p><p>The 34.17 is relative to lat/long and elevation but that number is the accepted one to use.</p><p>I dont understand how a cartridge could reach max energy of 900ft/lbs so long as velocity and bullet weight are high enough.</p><p>The actual energy of a loaded round is less straight forward because the potential energy of the propellant charge gets converted to sound, heat and kinetic energy of the bullet, so not all the energy goes into propelling the bullet, one example in a ballistics book I was reading just this morning calculated the actual energy propelling the bullet to be only 27%.</p></blockquote><p></p>
[QUOTE="birdiemc, post: 1787476, member: 29632"] Kinetic energy is physics ke=.5 x mass x velocity squared. For shooting we have to add in the acceleration due to gravity to convert from weight to mass and convert from grains to pounds so the formula becomes Ke= grains x velocity squared/ 2 x 7000 x 34.17 The 34.17 is relative to lat/long and elevation but that number is the accepted one to use. I dont understand how a cartridge could reach max energy of 900ft/lbs so long as velocity and bullet weight are high enough. The actual energy of a loaded round is less straight forward because the potential energy of the propellant charge gets converted to sound, heat and kinetic energy of the bullet, so not all the energy goes into propelling the bullet, one example in a ballistics book I was reading just this morning calculated the actual energy propelling the bullet to be only 27%. [/QUOTE]
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