I bought one of those back in the mid 70's when they first came out. Trouble was, at that time, the beer and pop cans in Canada were steel, thin, but steel and not aluminum. The system still worked just fine, except I didn't put kids toy caps inside. They just plugged the nipple, as my Hawken(custom) had a proper nipple and strong main spring, not coil. The hammer didn't lift off the nipple to let the pressure blow the manure out. I think I tried 3 or 4 then quit.
: I had to make them as they weren't available up in the bush where I was living.
: I bought a book called "The Underhammer Rifle and Pistol"
; In that book, I came across a formula for making my very own exceptionally dangerous priming compound. AS this compound was declared illegal in 1898 due to instability, I'll not give it here. The book didn't tell of this illegality (English law) or, of it's sensitivity. Apparently, a change of temperature would ignite it or arial static electricity. It was, however exceptionally potent, mixed into a slurry, then with a cut-off screwdriver with a 1/16' shaft, I'd get a single drop of mixture on the end, and let it run into the cap. When dry, they were great! Never had a misfire - never. The compound was corrosive, tho, and absolutely had to be cleaned THAT DAY IT WAS FIRED. It was so dry up in Smithers, that I could always clean the next day without any problem as the bore and barrel were bone dry. With the compound, it would start rust in about 5 hours & without moisture.
: If you wish this compound, you'll have to buy the book. I'm quit certain, due to the much purer chmicals today, the compound wasn't as bad as they said. Originally, it was used n the pill locks, tube locks as well as percussion caps. I would hate myself to give out the formula then have someone lose their life by mishandling- or by accident - as they said, with a change of temperature. To smack a bean sized lump on the anvil of the vise, it would throw the hammer out of your hand. Yeah - it sure ignited BP well and there wasn't but a thin layer inside the cap.
: Oh yeah- that was when I was a young gumby and impervious to damage - or thought so.
Daryl