Bullet Spin

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Bullet Spin

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Source: http://spectre23.wordpress.com/2009/08/23/sw-22a-shoots-like-a-champ/
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Rifling is the practice where an arrangement of spiral grooves is cut into the inside of the barrel of a gun. This causes the bullet to rotate when it is fired, this rotation or spin keeps a bullet from tumbling through the air making for more accurate shots. Spin As a bullet travels through the air its spin will slowly cause it to travel either to the left or to the right depending on its direction of rotation, this is referred to as gyroscopic drift or "spin drift". As a bullet spins clockwise it will slowly drift to the right, following the same logic if a bullet spins counterclockwise it will slowly drift to the left. This is caused by the bullets axis of rotation and the direction of the velocity vector of the center of gravity deviating as it spins through the air. This slight deviation is known as the yaw of repose. The magnitude of the yaw of repose is very small making its effect minimal in most short range situations. This is not the case in a long distance shot, the longer a shot is the more the spin of the bullet will affect the trajectory of the shot. Following this line of logic the farther a bullet travels the more it will drift either to the left or right depending on its rotation. Source:http://www.patagoniaballistics.com/images/balengine_clip_image003.jpg Some factors that directly affect the yaw or repose are as follows The length of a bullet The length of a bullet increases the yaw of repose because the longer a bullet is the more lateral lift it produces for any given yaw angle. The spin rate of a bullet As the spin of a bullet increases its left or right gyroscopic drift will increase, the spin rate can also have an affect on a bullet as it travels. If the rotation is to great, a lead or thinly jacketed bullet can be warped and deformed, decreasing accuracy. The air density As air density increases the drift from spin increases.

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