I have had a millet red dot on my ruger super blackhawk for the last three years and it works great. I also had one on my 45-70 contender for a year and it worked good, I took it off and put a scope on it because it is a 150yd gun. I don't feel the red dots are good past 75 yds because the dot starts to block the target when the distance increases.

SOTHRDNK