Just like the Maynard tape primer, I'm amazed they didn't find a work around.I was curious, so did a little research on Colt rifle chain fires. What happened with the Colt Rifle during combat was that the soldiers would spill powder into the nooks & crannies around the cylinder wile reloading. Apparently, it was quite something when the spilled powder cooked off. To prevent this, some commanders ordered their men to only load one shot at a time. An additional element was the lead shaving that has been referenced in this thread which was very painful.
While it could be very effective, a board of inquiry found the faults far overshadowed the benefits. Surplus Colt rifles sold for $42.
The Machine Gun, George M. China, 1851.