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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Is my twist rate OK for my 7mm??
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<blockquote data-quote="Joe King" data-source="post: 754894" data-attributes="member: 47325"><p>Yes that is correct, if a bullet is stabilized when it leaves your barrel it will remain stable until it reaches the sound barrier. A bullet flying down range does loose rpm, but at a slower rate than it looses velocity, so it will actually become more stable the farther down range it goes. The reason for that is because the slower a bullet goes the less force there is applied to the meplat trying to flip it over (cause it to tumble). Bullet simply cannot become unstabile in flight, unless it encounters major forces sufficient enough to over come it's gyroscopic forces. An example of those forces are, the shock waves encountered at the transonic stage, or a physical object.</p><p></p><p>A good explanation can be found here starting at the very end of the 4th page</p><p><a href="http://www.appliedballisticsllc.com/index_files/Understanding_part2.pdf" target="_blank">http://www.appliedballisticsllc.com/index_files/Understanding_part2.pdf</a></p></blockquote><p></p>
[QUOTE="Joe King, post: 754894, member: 47325"] Yes that is correct, if a bullet is stabilized when it leaves your barrel it will remain stable until it reaches the sound barrier. A bullet flying down range does loose rpm, but at a slower rate than it looses velocity, so it will actually become more stable the farther down range it goes. The reason for that is because the slower a bullet goes the less force there is applied to the meplat trying to flip it over (cause it to tumble). Bullet simply cannot become unstabile in flight, unless it encounters major forces sufficient enough to over come it's gyroscopic forces. An example of those forces are, the shock waves encountered at the transonic stage, or a physical object. A good explanation can be found here starting at the very end of the 4th page [url]http://www.appliedballisticsllc.com/index_files/Understanding_part2.pdf[/url] [/QUOTE]
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Is my twist rate OK for my 7mm??
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