Bob, this is off the top of my head but IIRC it has been done and is called the 22 Cheetah. It is was once a fairly popular conversion, again, IIRC.This is where a fella needs a copy of Frank Barnes "Cartridges of the World" In lieu of this I'm sure that Dave at chd4 (ch4d???) could help you out as well as CS at RCBS. I would think that you will need a set of forming dies as well. The loads would still have to be held to 38,000 psi. Overall the suggestion of the 22-250 is probably the way to go, just don't load it to full pressure if getting away from sticky cases is the goal, or is the goal a correct length throat? I believe the 219 Donaldson Wasp is also based on the 30-30 and was quite popular amoung the benchrest shooters in days past