Two good options with your 454 Super RedHawk.
If you have new in the wrapper Ruger Rings, you can contact Ruger and swap them for 30mm.
Option ONE: Swap for/or buy new a set of 30mm rings, and install a 30mm UltraDot. You will have a 4 MOA Dot at 100 yards, 2 Inch at 50 yards. You have a very good field of view. This is what I have on my 480 Ruger Super RedHawk.
Option TWO: Go to the Weigand Combat web site and order a Scope Base for the 480 Ruger Super RedHawk. The 480 Version requires the back sight to be removed because it has a Recoil Shoulder to soak up recoil, not just the ring screws.
You now have more room between the scope ring slots to space the rings further apart. A GOOD THING. Now you have the option of using a 30mm (6 Series) MatchDot II. The MatchDot II has several Dot configurations. The Dot in a Ring I believe is one of the options. My preference for hunting in low light is the 2 MOA Dot. Less Bloom in low light. You also get an Elevation Knob. With this base you can also install 3 scope rings, another good thing.
We went this route on my brothers 9.5 Inch 44 Magnum Super RedHawk.
If I were setting up another Super RedHawk, I would go with the Weigand Base for the 480, and a MatchDot II, and use 3 scope rings. Also order a set of Buttler Creek Flip Up Scope Caps while you are ordering the MatchDot.
I have ordered several UltraDot sights from:
http://www.ultradotwest.com/
I have had great service, and fast delivery.
I used handgun scopes on Contenders for years. I have had 2X , 4X, a 10X and several 2-7 Burris scopes. I like the UltraDot & MatchDot II optical sights much better than a scope at Revolver Range, which I consider to be 100 yards and under. The 30mm UltraDot is much quicker to get on target under field conditions.
Bob