Just got a new Cameron's 9-Major open gun and did some testing with CFE Pistol yesterday. This is my first open gun so I don't have anything to compare to. I tested two powders CFE & 3N37. Using 124gr Montana Gold Hollow Points, Federal SP Match Primers, once fired brass. COL 1.16".
Initial CFE load 7.1gr gave me a 10 round average of 1360fps 168.6 PF. At 15 yards aiming at the center of the A-zone the dot jumped off the paper. Very snappy feel.
7.5gr gave me a 10 round average of 1427fps 177 PF. This load the dot stayed on the paper but climbed to the upper A. Did not feel as snappy.
7.9gr gave me a 10 round average of 1460fps 181 PF. Major signs of over pressurization. Very flat primers. Too hot!
My bet the sweet spot for this gun/powder combo with be 7.3gr. Plan to test that this weekend.