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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist rate, how fast is too fast?
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<blockquote data-quote="WildRose" data-source="post: 2458626" data-attributes="member: 30902"><p>Type of rifling and depth of grooves can make a big difference.</p><p></p><p>Jacket type and thickness another big factor. If you have a really thin jacket and very tall lands with sharp edges you're going to have problems which will be magnified to some degree as the twist gets tighter.</p><p></p><p>All else being equal higher velocity is going to cause more and deeper engraving and the twist of the rifling can exert quite a stress on the jacket but may or may not be enough to cause most bullets to shed their jackets.</p><p></p><p>Gain twist barrels seem to be the worst about this because by the time a bullet gets out the end of the barrel the angle of attack on the bullet from the lands is constantly changing to an ever tighter twist.</p><p></p><p>I'm afraid for the most part it's an accumulation of tolerances where no one thing the factor but all combined they add up to a possible big problem.</p></blockquote><p></p>
[QUOTE="WildRose, post: 2458626, member: 30902"] Type of rifling and depth of grooves can make a big difference. Jacket type and thickness another big factor. If you have a really thin jacket and very tall lands with sharp edges you're going to have problems which will be magnified to some degree as the twist gets tighter. All else being equal higher velocity is going to cause more and deeper engraving and the twist of the rifling can exert quite a stress on the jacket but may or may not be enough to cause most bullets to shed their jackets. Gain twist barrels seem to be the worst about this because by the time a bullet gets out the end of the barrel the angle of attack on the bullet from the lands is constantly changing to an ever tighter twist. I'm afraid for the most part it's an accumulation of tolerances where no one thing the factor but all combined they add up to a possible big problem. [/QUOTE]
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Twist rate, how fast is too fast?
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