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Boresighting is a method of visually pre-aligning a firearm barrel's bore axis with the target, in order to more easily zero the gunsight (optical or iron sights). The process is usually performed on a rifle , and can be accomplished either with the naked eye, or with a specialized device called a boresighter .
Targets for large-bore use are 9.5 to 13 mm (3 ⁄ 8 to 1 ⁄ 2 in) thick hardened steel; small bore targets are 5 to 6 mm (3 ⁄ 16 to 1 ⁄ 4 in) steel, and airgun targets are 3 mm (1 ⁄ 8 in) steel, although some aluminum targets are produced. Ranges are measured in meters only.
The bore axis of a firearm is the longitudinal axis through the geometric center of the gun barrel. In a rifled barrel, the projectile (bullet/ball, pellet or slug) will spin around the bore axis as it goes through the barrel. Boresighting is a process of placing one's line of sight down along the bore axis.
Shooting targets are objects in various forms and shapes that are used for pistol, rifle, shotgun and other shooting sports, as well as in darts, target archery, crossbow shooting and other non-firearm related sports. The center is often called the bullseye. Targets can for instance be made of paper, "self healing" rubber or steel.
The bore angle is set to ensure that a bullet on a parabolic trajectory will intersect the LOS to the target at a specific range. A properly adjusted rifle barrel and sight are said to be "zeroed." Figure 3 illustrates how the LOS, bullet trajectory, and range ( R H {\displaystyle R_{H}} ) are related.
Boresight (firearm), adjustments made to an optical sight, to align the barrel of a firearm with the sights Boresight point, also known as gun harmonisation , the alignment of weapons in an aircraft Project Boresight , a US radio direction finding system
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[1] [2] For targets beyond-blank range, the shooter will have to point the barrel of their firearm at a position above the target, and firearms that are designed for long range firefights usually have adjustable sights to help the shooter hit targets beyond point-blank range. The maximum point-blank range of a firearm will depend on a variety ...