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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What effect does the number of grooves have in magnum calibers?
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<blockquote data-quote="MagnumManiac" data-source="post: 1976149" data-attributes="member: 10755"><p>My 4 groove and 3 groove barrels are faster than my 5 groove or 6 groove barrels.</p><p>Twist rate does not appear to affect velocity.</p><p>As I have shot all of the above in the same calibre/cartridge side by side with differing twist rates and the test can be done on different days with the same results.</p><p>Can't say why twist doesn't affect velocity, but groove number all boils down to friction and the amount of bullet obturation into the rifling.</p><p>The less deformation and friction the faster the bullet goes for the same amount of pressure.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1976149, member: 10755"] My 4 groove and 3 groove barrels are faster than my 5 groove or 6 groove barrels. Twist rate does not appear to affect velocity. As I have shot all of the above in the same calibre/cartridge side by side with differing twist rates and the test can be done on different days with the same results. Can’t say why twist doesn’t affect velocity, but groove number all boils down to friction and the amount of bullet obturation into the rifling. The less deformation and friction the faster the bullet goes for the same amount of pressure. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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What effect does the number of grooves have in magnum calibers?
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