I'm interested in the response to this question also, but I think you should specify what type of sights you are using. The targets I have always used for sighting in and testing loads with my scoped centerfire rifles don't seem to be the best for use with my muzzleloader with the fiber optic sights. What I ended up using was some 1 inch orange dots that I had, and I have been just sticking them on the back side of my targets. The 1 inch dots seem to work good for 25 yards, and at 50 they get a little hard to see, and at 100 I had to put 4 dots together. I think some larger dots would be better, maybe a 3 inch for 50 yards and a 6 inch for 100, but I haven't been able to find any at the local stores. Also I'm not sure if black or orange is better, and ifa circle or a square is better. Next time I go out to the range I think I'm just going to try making my own targets with a black marker. But I sure would like tohear from some people who are more experienced with shooting open sights. I'm really having trouble getting the sights lined up the same every time.