He shouldn't unwrap his paper cartridge - the diameter of the ball was precisely designed to take into account the paper strength - and still both can be loaded fairly easily when using paper strength and ball diameter as in the contemporary regulations.
I wasn't a very good shot, but I shot my M 1777 fusil d'infanterie replica (Perdersoli) - with according to regulations fixed paper, ball, and powder (which was a lot, half ball weight) - completly dressed up - including carrying a back pack and fixed bayonett - on a man sized target - distance - alas only 100 meter, direct shot, I could hit 3 out of 5 shots (taking into account my shooting mistake pulling the musekt down when squezing the trigger, so in constrast to a lot of others - I had to aim high, usually at the "helmet" of the target.
As written above, the target was bigger than one man (usually a formation) and more than one was shooting.
The military philosophers, like Clausewitz, who did see military combat and had a deep understanding, typically argue (in my view) from the academic point - the high art, the ideal condition - the practise may look differently, and I deeply believe, in contrast to all usuall predominant views, that infantriy did open fire much earlier than ideal conditions and despite we might deem it was waste of ammunition, it wasn't in their eyes.
So we have the ideal view and reality.
See also my response to Dave above