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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet rotation vs velocity
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<blockquote data-quote="RockyMtnMT" data-source="post: 220760" data-attributes="member: 7999"><p>I have questions about bullet physics brought up by the HAT bullet test thread by Goodgrouper. I did not want to ask these ?'s on that thread for fear of being misunderstood in my intentions. My ? is in no way directed towards GG's testing.</p><p></p><p>What I want to know is, what is the rate of decline for the bullet spin as it travels down range? I have never heard that a bullet has to start off w/ enough rpm's in order to have enough down range to remain stable.</p><p></p><p>Does rpm slow down at the same rate that velocity slows down? The only info that I know of is that it takes a certain bullet stabilization factor, depending on the length of the bullet. That it takes less stabilization for longer ranges, but that a bullet w/ proper stabilization for 500yrds and beyond will not function well for hunting under 500yrds. The longer the bullet gets the more critical this becomes because of the issue of tumbling on impact. In my simple mind, the more spin the better. I know this doesn't work, but it seems that way. I know some bullets will come apart due to centrifugal force if over ratated.</p><p></p><p>I am getting a little long winded for a short question. How much rpm is lost per yard down range?</p><p></p><p>Thanks, Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 220760, member: 7999"] I have questions about bullet physics brought up by the HAT bullet test thread by Goodgrouper. I did not want to ask these ?'s on that thread for fear of being misunderstood in my intentions. My ? is in no way directed towards GG's testing. What I want to know is, what is the rate of decline for the bullet spin as it travels down range? I have never heard that a bullet has to start off w/ enough rpm's in order to have enough down range to remain stable. Does rpm slow down at the same rate that velocity slows down? The only info that I know of is that it takes a certain bullet stabilization factor, depending on the length of the bullet. That it takes less stabilization for longer ranges, but that a bullet w/ proper stabilization for 500yrds and beyond will not function well for hunting under 500yrds. The longer the bullet gets the more critical this becomes because of the issue of tumbling on impact. In my simple mind, the more spin the better. I know this doesn't work, but it seems that way. I know some bullets will come apart due to centrifugal force if over ratated. I am getting a little long winded for a short question. How much rpm is lost per yard down range? Thanks, Steve [/QUOTE]
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Bullet rotation vs velocity
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