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The Range
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.45 ACP and Pressures
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<blockquote data-quote="Rod Snell" data-source="post: 804726" data-attributes="member: 796"><p>First, the calculated recoil is more if the powder charge is greater, so fewer grains of a fast powder produces less recoil.</p><p></p><p></p><p><a href="http://www.handloads.com/calc/recoil.asp" target="_blank">http://www.handloads.com/calc/recoil.asp</a></p><p></p><p>However, this is not the whole story. The RATE (first derivative) of momentum transfer makes the recoil feel "sharper."</p><p> </p><p>Think of a large sledge hammer being swung in just a gentle arc against your outstretched hand, not enough to hurt. Your hand is for sure going to be pushed out of the way, but relatively slowly. Now consider a tack hammer swung hard enough to have the same momentum as the sledge; it is going to be moving a lot faster, and your hand is going to receive the momentum very quickly: it will HURT! We talk a lot about energy of projectiles, but momentum is the quantity conserved in a collision.</p><p><a href="http://en.wikipedia.org/wiki/Recoil" target="_blank">http://en.wikipedia.org/wiki/Recoil</a></p><p></p><p>That's why those 12oz guns leave your hand numb with just a moderate load.</p><p></p><p>FELT recoil, or what the shooter can tolerate. is highly subjective and I don't know how to quantify that.</p></blockquote><p></p>
[QUOTE="Rod Snell, post: 804726, member: 796"] First, the calculated recoil is more if the powder charge is greater, so fewer grains of a fast powder produces less recoil. [url]http://www.handloads.com/calc/recoil.asp[/url] However, this is not the whole story. The RATE (first derivative) of momentum transfer makes the recoil feel "sharper." Think of a large sledge hammer being swung in just a gentle arc against your outstretched hand, not enough to hurt. Your hand is for sure going to be pushed out of the way, but relatively slowly. Now consider a tack hammer swung hard enough to have the same momentum as the sledge; it is going to be moving a lot faster, and your hand is going to receive the momentum very quickly: it will HURT! We talk a lot about energy of projectiles, but momentum is the quantity conserved in a collision. [url]http://en.wikipedia.org/wiki/Recoil[/url] That's why those 12oz guns leave your hand numb with just a moderate load. FELT recoil, or what the shooter can tolerate. is highly subjective and I don't know how to quantify that. [/QUOTE]
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