I respectfully disagree with the statement that the ball "rattled" around in the bore. Yes, the ball was smaller than the bore. The standard British BB load consisted of a .69 ball fired from a .75 bore. When the ball was rammed down on top of the powder, the cartridge paper was forced into the spaces between the ball and the barrel. Was it as tight a fit as a cloth or leather patch in a rifle? No way - nor was it capable of delivering anywhere near the same accuracy as a tight fitting rifle ball - but to say that the ball "rattled" around in the barrel just isn't the case. Sure, if you dropped a bare ball down the barrel it would rattle, but the cartridge paper took up most of the windage.