My two favorites are the Bushnell TRS-25 and the UltraDot red dots. Have used both on everything from 22 to 12 gauge slug guns. I have 2 of the Bushnell's, on a 45l70 and on a 10/22 TD. I have UltraDots on a 44 mag and an AR15.
The UltraDot should fit in your rings if 1" or you can opt for a 30mm and swap rings. With the Bushnell you probably need an adaptor like Weigand makes to take Weaver style rings.