Mike, rimfire would be impractical for what it would cost to have it done. I might be wrong about that but I think it would be very expensive. The pistol on the other hand might be as easy as changing cylinders and setting the barrel back. The 32-20 brass is nearly as long as the OAL of the 32mag. There might be a way of using inserts in the chambers to reduce to the .32 mag dimensions but I think accuracy would probably suffer if it was feasible at all. George