Hick,
I have used 2 brands Ultradot that I got from EABrown Co and a Leupold/Gilmore.The Ultradots havebeen on my 10 ga NEF and 12 ga guns. The leupold Gilmore was on a Black powder and I have had no probs. with either. I do like the Leupold/Gilmore better, its bigger at 35mm.

Jim