I was going to warn you about the fit problem with Ruger rings. My Redhawk is looking for a new red dot but none, so far, fit the rings. I had an Aimpoint 1000 for years until the .44 mag. recoil killed it.
As for scopes, a handgun is not a long range rifle. You only need to line up the eye with the target. A 1 1/2 or 2X scope is perfect for you needs. BTW, many scopes need high rings to clear the bells from the pistol.