Templer,
Smo nailed it. Goggle, Sighting in the Black Powder Rifle, by B E Spencer. Its the distance from the muzzle. Lot of good info there, and im gonna try it out. I think it will work super, and make sighting in a whole lot faster, with less chance of filing front sight to much. Caution - Take your time reading it, as it can be mind blowing, if you don't. LOL!
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