The rifling inside this barrel makes the gun much more accurate.
Most firearm barrels are "rifled" to increase accuracy. This technology was first introduced in the 1840s. The rifling is a set of spiraling incisions along the interior length of the barrel. These grooves spin the bullet as it travels down the barrel, thereby increasing the bullet's accuracy. However, rifling in a particular barrel must be matched to the proper bullet weight to prevent it from tumbling downrange instead of spinning. Barrel twist rates are expressed in a ratio of one turn to so many inches of barrel. For example, if the grooves make one turn around the barrel every 10 inches, the twist rate is 1:10.
Instructions
1. Mark a line down your cleaning rod. Draw a straight line down the side of your cleaning rod. The line should run from one end of the rod to the other.
2. Start a cotton patch down the muzzle. Using your cleaning rod, insert a cotton patch into the front of your barrel as if you were cleaning the bore.
3. Mark your starting place on the rod and the barrel. Before driving the rod into the barrel, mark where the line on your rod intersects the rim of the barrel. Mark this spot by crossing the existing line on the rod, and by making a small mark on the barrel.
4. Drive the rod into the barrel. As you do, the rifling will turn the cotton patch and the rod with it. Mark your rod when it makes a complete rotation within the barrel. Continue driving the rod into the barrel until it makes a second rotation. Mark this spot as well.
5. Measure between the marks. Your rod should have three marks: a beginning, one rotation and two rotations. Measure between the first rotation mark and the second rotation mark. This distance (in inches) is equal to the second number in your barrel twist ratio. For example, if you measure 10, 12 or 13 inches, your rifling twist rate is 1:10, 1:12 or 1:13.
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