With a 2moa red dot, I find it easy using them out to 210 yards. As long as it is a good quality red dot. My Aimpoint Pro works much better for me at that distance than my Trijicon MRO. Using the Aimpoint on one of my AR's it is easy to keep all the hits well within my 8" steel plate. Take into consideration that I am not a skilled bench rest competitor by any means. And, that takes calmer winds than RR deals withJEBar wrote:interesting Red Dot .... at what ranges do you feel they are effective

210 yards is the longest I've used red dots. I can shoot out to as far as 300 yards on that range. However, the lighting is extremely poor. Targets are heavily shaded and extremely difficult to see. I find it rather difficult to see the permanently mounted steel plate at 300 yards even with my variable 1.5-4 power scope.