Do a search on Yahoo. You will get several hits on previous Forum threads. I remember, years ago, prior to small rifle primer pockets in .454 Casull brass, that bushings were available to convert large to small. If memory serves correct, they were steel and it was a one time process. Depriming and repriming was done as usual after conversion. Remember large pistol primers are .006 shorter and you're still going to have same size flash hole. Don't know if that would make any difference or not. You might contact Freedom Arms and see if anyone remembers. I think that was the source.