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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Twist
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<blockquote data-quote="Neverlost1" data-source="post: 77988" data-attributes="member: 4569"><p>Maybe a short description of a lengthy subject may help. You have two factors working against each other when considering barrel twist rates. First is the bullet's imbalance. Most bullets center of gravity and center of spin are not going to be perfect, considering manufacturing tolerences and what happens to a bullet from the forces during firing. The faster you spin a bullet the more it will wobble due to this imbalance, , the worse the dispersion will be, and the bigger your groups will be. For this reason, you would want the slowest twist possible to stabilise you bullet and and keep this effect to a minimum. The second factor to consider is from the bullet's impact with the atmosphere. I believe this has a greater effect on a bullet's stability than the first. This impact with the atmosphere causes the bullet to yaw. To overcome this, you have to spin the bullet faster. As you can see, you have to compromise imbalance stability for atmospheric pressure stability. Will you be using the gun for target shooting or hunting? Will you always hunt in the same area or maybe an elk hunt in the mountains and a deer hunt at sea level? If your going to use the gun at varried locations, you should probably go with the faster twist rate. Here is a link with some outstanding information on the subject:</p><p></p><p><a href="http://www.riflebarrels.com/articles/bullets_ballistics.htm" target="_blank">http://www.riflebarrels.com/articles/bullets_ballistics.htm</a></p></blockquote><p></p>
[QUOTE="Neverlost1, post: 77988, member: 4569"] Maybe a short description of a lengthy subject may help. You have two factors working against each other when considering barrel twist rates. First is the bullet's imbalance. Most bullets center of gravity and center of spin are not going to be perfect, considering manufacturing tolerences and what happens to a bullet from the forces during firing. The faster you spin a bullet the more it will wobble due to this imbalance, , the worse the dispersion will be, and the bigger your groups will be. For this reason, you would want the slowest twist possible to stabilise you bullet and and keep this effect to a minimum. The second factor to consider is from the bullet's impact with the atmosphere. I believe this has a greater effect on a bullet's stability than the first. This impact with the atmosphere causes the bullet to yaw. To overcome this, you have to spin the bullet faster. As you can see, you have to compromise imbalance stability for atmospheric pressure stability. Will you be using the gun for target shooting or hunting? Will you always hunt in the same area or maybe an elk hunt in the mountains and a deer hunt at sea level? If your going to use the gun at varried locations, you should probably go with the faster twist rate. Here is a link with some outstanding information on the subject: [url="http://www.riflebarrels.com/articles/bullets_ballistics.htm"]http://www.riflebarrels.com/articles/bullets_ballistics.htm[/url] [/QUOTE]
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Barrel Twist
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