I just got bacl from the SCI Convention. At the show got a double rifle in 17 bore made by;
William Lee
28 Lancaster St.
Birmingham
It has about 1 in 60 inch twist and is chambered for the 20 gauge brass case loaded with a 17 bore projectile. It came cased with a late round ball mold but the greenhill formula figures that it will take a bullet up to 1.05 inches long.
Any information on loading or this maker would be of a great help.