Within a few days, I'll have an 8-25 Leupold VXIII (new, only installed on rifle) that I plan to replace with a more suitable hunting scope on a .22-250. They go for $1Kish but I'll part w/ it for 750ish. I'm unsure if it's NOS or new so 1" or 30mm TBD. IF the rings you have are of sufficient thickness and your target rifle isn't too huge a caliber, you can easily have a machine shop open your rings to accomodate a 30 mm scope. I had some really nice Austrian or German bock mounts that needed same (they were like 3/32" thick once bored out but never had an issue on a .375 using the newer VX 6 30mm.) They can also be align-bored to ensure the scope lines up with the bore (as many factory rings aren't quite perfect. A good gunsmith can do this as well. 25.4 mm to 30 mm.