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Hunting
The Basics, Starting Out
"Knock down" power
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<blockquote data-quote="Jon A" data-source="post: 51611" data-attributes="member: 319"><p>Dave, your conclusions are correct but your math is wrong <img src="http://images/icons/wink.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> Let's see if I can help. <img src="http://images/icons/smile.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Energy isn't what we're concerned about, it's conservation of momentum (mass*velocity, not 1/2mv^2).</p><p></p><p>The mass of the bullet times it's velocity will be equal to the mass of the deer+bullet times their velocity after the hit (assuming they stick together).</p><p></p><p>For example, say you hit a 150 lb deer with a 180 traveling at 3000 fps. The velocity of you impart on the deer will be 180*3000/(150*7000+180)=0.514 fps. Pushing a deer sideways with your pinky at 1/2 a fps is hardly going to knock it down.</p><p></p><p>The same goes for the recoil you absorb, except in this case you'll absorb more than the bullet will expend on the target because the mass and velocity of the powder is working against you but won't make it to the target.</p><p></p><p>Make sense?</p><p></p><p>I too get a chuckle when I see somebody get knocked accross the room, up into the air and out the window, etc after being shot in a movie.</p></blockquote><p></p>
[QUOTE="Jon A, post: 51611, member: 319"] Dave, your conclusions are correct but your math is wrong [img]images/icons/wink.gif[/img] Let's see if I can help. [img]images/icons/smile.gif[/img] Energy isn't what we're concerned about, it's conservation of momentum (mass*velocity, not 1/2mv^2). The mass of the bullet times it's velocity will be equal to the mass of the deer+bullet times their velocity after the hit (assuming they stick together). For example, say you hit a 150 lb deer with a 180 traveling at 3000 fps. The velocity of you impart on the deer will be 180*3000/(150*7000+180)=0.514 fps. Pushing a deer sideways with your pinky at 1/2 a fps is hardly going to knock it down. The same goes for the recoil you absorb, except in this case you'll absorb more than the bullet will expend on the target because the mass and velocity of the powder is working against you but won't make it to the target. Make sense? I too get a chuckle when I see somebody get knocked accross the room, up into the air and out the window, etc after being shot in a movie. [/QUOTE]
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The Basics, Starting Out
"Knock down" power
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