Years ago, I got roped into going to rendezvous that I really hadn't planned on going too. So, since it was the last minute, I just threw all my gear in the truck, and headed out. When I arrived it was drizzling rain. The next morning it was still drizzling, and since it had been raining all night, the moisture in the air surely would create ignition problems for us. The group I was shooting with were shooting trade guns, so the cap gun crowd started heckling from square one. The first target was a long gong, out about 150 yards. I measured out my regular charge of 70 grins. of 2FF and made my shot. An enormous cloud of smoke encircled us and the ball fell about ten yards short of the gong. Everybody roared, and then I realized that I had been experimenting with shooting some 3FA blasting powder I'd been given, and hadn't refilled my horn with 2F. This stuff was very old, and heavily graphite coated. I double dipped my measure for the next target and other than the smoke, it shot fine. By the end of the course all the guys in the my group were loading out of my horn, and not a cap gun was functional.
This keg of powder from the Giant Powder Comp. was found, as a rancher made one last pass through an old hay barn, that the fire department was scheduled to burn down for practice. It was wedged between one of the poles holding up the roof and a cross buck. I had about six pounds of powder in it. And, I still have the old keg, although I've shot up all the powder.
Hungry Horse