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The bore of a rifle is grooved, which puts a spiral spin on the bullet for greater accuracy.

Rifling forces the bullet to spin, which allows it to travel straighter. The more lands and grooves a rifle barrel has, the faster the bullet spins and a faster spinning bullet travels straighter.

The length of a rifle barrel will affect the length of time the bullet travels straight after leaving the barrel. A longer barrel will normally allow the bullet to travel straighter further than a shorter barrel (assuming the same bullets are used). Keeping your rifle clean will also help your bullets travel where you aim them to go.

Rifle, handgun, and shotgun bores showing lands and grooves
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