I either run 7/8oz of nickle plated shot with 25.3 grains of Longshot at 1390 or 1 1/8oz with 24 grains of Longshot at 1250, depending on the time of year and the wad I use.
Most times however I can shoot the first .
75 FPS isn't a whole lot of difference with the same shot charge IMO if the payload is the same.
DT