I just had this one made, it is an 18" McGowen barrel with a 1 to 8.5 twist. It has a Jewel trigger and was made by Harvey King of HK Custom guns in Valley Grand, AL. I went through the break in proceedure of the first ten shots of shot and clean, then started the 3 rounds and clean. On the third set I got a .272 group and that is the last that I have had time to shoot. Here are some pic's.
Last Three Shot Group
Pistol after I painted the stock.