I don't accept your hypothesis because you are trying to prove a negative, ie what canister doesn't do. No one, by the way, said that the canister disintegrates or disappears. That is adding a strawman to the discussion. One of the ways of finding out how the round works is the residue that is found after the round is fired. There were different methods of constructing canister but the basic fact remains that the rounds all generally acted in the same manner-the canister is ruptured by the force of the piece being fired and the balls separate in a cone-shaped pattern going down range. That is the point of the exercise as it is an anti-personnel round.