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Coyote Hunting - From 10 Yards to over 1,000 Yards
Twist Rates. Which one?!
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<blockquote data-quote="marksman3006" data-source="post: 537893" data-attributes="member: 34392"><p>I realize this is an older thread but was wondering why it didn't get more responses, because this is a great question.</p><p> </p><p>I'm not really qualified to talk about it but Ill give it a shot (no pun intended). </p><p> </p><p>As I understand it, the rotation of the bullet stabalizes it like when you throw a footbal. The rate of twist is how many inches the bullet travels in the barrel to make one revolution. So 1-9 is faster spin than 1-11 because it only has to travel nine inches to make one rev as oposed to eleven inches.</p><p> </p><p>Anyhoo, the bullet is spinning its ___ off. Thousand of RPMs. This helps it fly straight and true and I think it helps reduce drag also (not sure though).</p><p> </p><p>I have read that some bullets will group smaller at longer ranges because the bullet needs time to go to sleep. Not that it is tired but, but like the football, it takes some distance for the spin (wobble) to settle out.</p><p> </p><p>Correct me if I'm wrong but heavy bullets need more spin. So when you increase weight you may get better terminal ballistics but sacrifice some accuracy. The bullets Ballistic Coefitient represents how well it travels in the air. It is based on the shape(ogive) and sectional density. Sectional density is how fat the bullet is in relation to how much it weighs. A higher BC is a more efficient bullet.</p><p> </p><p>So I recomend referencing a reloading book and decide what ballance you want between flat trajectory and down range stopping power and then chose the bullet weight and twist rate that meet your needs. Of course you would verify performance by testing at the range and in the field.</p><p> </p><p>As for heavy barrels, they are not as handy or quick pointing in the field but offer more accuracy in that they are stiffer and affected less by harminics that develop in the barrel during the shot.</p></blockquote><p></p>
[QUOTE="marksman3006, post: 537893, member: 34392"] I realize this is an older thread but was wondering why it didn't get more responses, because this is a great question. I'm not really qualified to talk about it but Ill give it a shot (no pun intended). As I understand it, the rotation of the bullet stabalizes it like when you throw a footbal. The rate of twist is how many inches the bullet travels in the barrel to make one revolution. So 1-9 is faster spin than 1-11 because it only has to travel nine inches to make one rev as oposed to eleven inches. Anyhoo, the bullet is spinning its ___ off. Thousand of RPMs. This helps it fly straight and true and I think it helps reduce drag also (not sure though). I have read that some bullets will group smaller at longer ranges because the bullet needs time to go to sleep. Not that it is tired but, but like the football, it takes some distance for the spin (wobble) to settle out. Correct me if I'm wrong but heavy bullets need more spin. So when you increase weight you may get better terminal ballistics but sacrifice some accuracy. The bullets Ballistic Coefitient represents how well it travels in the air. It is based on the shape(ogive) and sectional density. Sectional density is how fat the bullet is in relation to how much it weighs. A higher BC is a more efficient bullet. So I recomend referencing a reloading book and decide what ballance you want between flat trajectory and down range stopping power and then chose the bullet weight and twist rate that meet your needs. Of course you would verify performance by testing at the range and in the field. As for heavy barrels, they are not as handy or quick pointing in the field but offer more accuracy in that they are stiffer and affected less by harminics that develop in the barrel during the shot. [/QUOTE]
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Coyote Hunting - From 10 Yards to over 1,000 Yards
Twist Rates. Which one?!
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