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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
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<blockquote data-quote="Bart B" data-source="post: 1798961" data-attributes="member: 5302"><p>Yes.</p><p></p><p>The rifle moves backwards while the bullet goes through the barrel. Recoil force is centered on the bore axis. As the center of mass holding the rifle is not on the bore/recoil axis, the bore axis angle and direction to the line of sight changes during barrel time.</p><p></p><p>Therefore, the bore axis at the muzzle doesn't point above the desired point of impact on target equal to bullet drop plus sight height until the bullet leaves the muzzle.</p><p></p><p>Anything that changes the recoil axis angle to center of mass holding it or the amount of resistance to recoil will change the bullet departure angle and direction relative to the line of sight when the round leaves the barrel. This is why the sight zero obtained from a bench top position will be up to 2 MOA different than those in field positions without artificial support.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1798961, member: 5302"] Yes. The rifle moves backwards while the bullet goes through the barrel. Recoil force is centered on the bore axis. As the center of mass holding the rifle is not on the bore/recoil axis, the bore axis angle and direction to the line of sight changes during barrel time. Therefore, the bore axis at the muzzle doesn't point above the desired point of impact on target equal to bullet drop plus sight height until the bullet leaves the muzzle. Anything that changes the recoil axis angle to center of mass holding it or the amount of resistance to recoil will change the bullet departure angle and direction relative to the line of sight when the round leaves the barrel. This is why the sight zero obtained from a bench top position will be up to 2 MOA different than those in field positions without artificial support. [/QUOTE]
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