I need to try that with my 45-70. The first time I ever say a trapdoor, I was about 20 yrs old, about 50 yrs ago,,,,, a friend had one, we were out shooting it, and he used a case, and a hand primer, and he would fill the case with black powder, and put a ball in the neck, and shoot it., Darn thing shot great. Have not thought about that in yrs. Wallacem