I was not being condescending and I am sorry you feel that way. It certainly was not intended.
I've also answered your unknown question of three: at least Col Elting did. The canister itself was ruptured in the gun tube releasing the balls and they were 'chased' out of the gun tube by the iron base. What else would happen in the gun tube after firing? The reason the canister was made of tin was so that it would rupture upon firing. It was the force of the explosion of the charge that made that happen and then the balls were propelled out of the gun tube.
I believe it to be a simple concept, just as the round was very simple in makeup and according to Muller very effective.