I appreciate all the responses, but there will be no reaming, conversions, or alterations of any kind on this piece. We like to keep our vintage weapons 100% original as it is. But if .25-10 is interchangeable with 25 Steven, someone hammer the gavel on the verdict with that. I don't want to try it if it's not meant to be. Thanks for the supply sources too, I'll check to see if they can get their hands on some for me or not.