Moses,
If you already have the 9x70R, we can help you load it using off the shelf dies. If you don't have one yet, do not buy a 12/12x30-06, you won't be satisfied in the long run. 6.5/7/8/or9x57R, or 7x65R/ 9.3x74R would all be fine and reasonably easy to load or buy. There are a good many 2 3/4" 16ga drillings on the market, look for post WW2 dates. If you especially want an Old caliber, we can help you with loading those also.
Mike