I will tell you what works for me. My smoothie is a twenty gauge home grown chiefs grade with a 30” barrel. When I built it I got impatient to shoot it, and rushed things. I had bought one of those fancy brass front sights that looked like a turtle, but couldn’t find it. So, I took a steel solder on barrel lug, and filed it into a sight blade, and soldered it on the barrel. In my haste to get the gun running, I got my new sight about a sixteenth to the left. After shooting it quite a bit I elected to bend the barrel up at the muzzle. What I found was that if I put my target in the right side corner where the blade and the square shouldered base converge, that where the ball went. I do have the tang screw oriented so the slot can be used as a reference, but not an actual rear sight. This little gun will shoot like a rifle out to about sixty five yards. It kind of like having a peep sight on the muzzle of your gun.
I started shooting bare ball loads in this gun because the pressure from the patched ball loads eventually straightened out the barrel, and it had to be re-bent.
Hungry Horse