I, for one, hate sighting in open sight guns, I always use AT LEAST, a box of shells getting them sighted in, I have also noticed, that every open sighted gun, is a little different, if you can get the gun to shoot where you aim, then you are doing it right, you may burn quite a bit of ammo, but, guns were made to be shot.I'm pretty sure you are doing it right. I just use a spent casing to make my adjustments.TUK, you are doing it right, my man, it just takes a little time, and ammo.