Just got home from the range where I was shooting a couple of my derringers across my chronigraph. This time out I took my Classic arms Twister and my Pedersoli screw barrel pistols and loaded them with 777. Performance was erratic but 777 gave better velocities than both Pyrodex P and Goex3f. The twister was loaded with 17 grains of 777 under a .350 ball in a .015 patch and a remington #11 cap.The highest velocities were 807 ft/sec and 680 ft/sec generating 94 and 64 ft/lbs of pressure respectivly. Not bad for such a little pop gun. I loaded the screw barrel with 10 grains of 777 under a .454 ball swagged into the barrel breech. Its top velocity was 540 ft/sec generating 91 ft/lbs of pressure. The other shots remained in the mid 400's for velocity generating around 60 ft/lbs of pressure. Though mouse guns by todays standards I can see why our forefathers carried them "just in case".
Don
Don