Summary: In order to zero a muzzleloader, find out where the sights are going to be set and file the front sight if the shooting is low. Find out how to move rear sights to the left to compenstate for a muzzleloader shooting right with help from a shooting instructor and range officer in this free video on muzzleloaders.
"We're going to talk about zeroing one of this guns in, sight it in, how do they call it? What you have on a black powder rifle is primitive sights. You got your rear sight which is a buckhorn sight, pre-1840 type stuff. You just have a blade in the front. How you sight this in is basically like any other rifle. Put in on paper, see where you're shooting first. On your left side, on your buckhorn, if you're shooting to the right you move the rear sight to the left. On your front sight, you do just the opposite. If you're shooting to the right, you move the front sight to the left. So, anyway, that's how you sight this in. You get your up and down sighting by filing the front sight if you're low, you'd have to file the front sight, if you're shooting high then it has to be a taller front sight. Anyway, that's how you sight this in. There are fixed sight, once you get 'em sighted in, they're pretty well there. You have to hammer 'em left or right or file the front sight to get 'em sighted in."
eHow Article: How to Zero a Muzzleloader
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