Thread: 30 MOA rings

Does anyone know if 30mm scope rings with 30 MOA elevation built in are available? I have a Savage 110 in .338LM which has a 20 MOA factory rail, but I need a total of 50 so I can adjust from a 200m zero to a 2000m zero. The way I do this currently is with a 20 MOA weaver riser on top of the factory rail, and Burris rings with 10 MOA inserts, but this setup sits very high and I'd rather use more robust rings. Any input is appreciated, I haven't seen any 30 MOA rings, at least not in NZ, I suppose I could see if someone could make a set of one-piece base/rings with 50 MOA that will go straight on a Savage action.
Cheers, Tom