I don't ride horses and have never been in battle on one but it seems to me this reloading on a moving horse takes a good bit of concentration. If you are sitting up on horse not really paying attention to your surroundings and the enemy is around you will be a prime target...goodbye. I think I'd rather get to good cover where I could stop and quickly reload but I imagine that back then it was the same as now....there is the right way, the wrong way, and the Army way of doing things.
