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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet weight vs length / barrel twist
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<blockquote data-quote="J E Custom" data-source="post: 1045225" data-attributes="member: 2736"><p>Normally bullet weight dictates barrel twist because of velocity and BCs of the bullet used.</p><p></p><p>The heavier the bullet the slower the velocity and the faster the twist rate normally.</p><p></p><p>Trimming the meplat may improve the ballistics of the bullets (More uniform) but it should not effect the twist rate.</p><p></p><p>The object of proper twist rate is to stabilize the bullet (You can over rotate the bullet just as easy as under rotating it by picking the wrong twist. </p><p></p><p>The most common twist rate for a 175 grain+ bullet in a .223 is a 1 in 7. and a 1 in 8 for 50 to 70 grain bullets a 1 in 9 or 1 in 10 are normally used with bullets weighting less than 55 grains. The fast 22s (220 swift and the 22 250 will normally have a 1 in 12 to 1 in 14 twist because of there velocity.</p><p></p><p>To get good groups you may have to go to 45 or 50 grain bullets.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1045225, member: 2736"] Normally bullet weight dictates barrel twist because of velocity and BCs of the bullet used. The heavier the bullet the slower the velocity and the faster the twist rate normally. Trimming the meplat may improve the ballistics of the bullets (More uniform) but it should not effect the twist rate. The object of proper twist rate is to stabilize the bullet (You can over rotate the bullet just as easy as under rotating it by picking the wrong twist. The most common twist rate for a 175 grain+ bullet in a .223 is a 1 in 7. and a 1 in 8 for 50 to 70 grain bullets a 1 in 9 or 1 in 10 are normally used with bullets weighting less than 55 grains. The fast 22s (220 swift and the 22 250 will normally have a 1 in 12 to 1 in 14 twist because of there velocity. To get good groups you may have to go to 45 or 50 grain bullets. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet weight vs length / barrel twist
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