RE: Shotgun Scopes
What brand of scope are you looking at ? The 2.5 x 20 mm would work. When purchasing your scope make sure you have good eye relief or you will end up with a cut as Booney mentioned because the shotgun has a heavy recoil. Personally I wouldn’t go with anything bigger then a 40 or 42 mm objective lens. What ever you do don’t go to cheap.