I havnt witnessed a refill yet. I had a jam (which is not supposed to happen) and had to wait for the guy to virtually disassemble the machine to get to the tubes! I assume they put roughly equal quantities in each tube but I certainly found that in a half full machine a couple of tubes were normally full and the others run down. Of course I was after the ones in the full tubes... assuming of course that the fill matched the displayed one! In Bills and Sierra Sids, half the strikes coming out didnt match any of those displayed!