A really experienced shooter might be able to load on a musket on the run like that, but I really don't think it would be remotely possible with a rifle. Rifles took much longer to load, as the ball, wrapped in a lubricated patch, had to be a tight fit in the bore in order to engage the rifling and shoot accurately. Consequently the balls were much harder to ram down, and while a musketeer could fire of three rounds a minute, and a good one, could just manage four, a rifle like the ones used in this movie were limited to no more than two shots a minute because of the more difficult reloading. That's the main reason the smoothbore musket was the preferred military weapon: it actually allowed greater firepower in massed volleys because of the faster rate of fire, that and rifles would become much harder, or even impossible to load after several shots from steadily accumulating black powder fouling in the barrel.
This problem wasn't solved until the invention of the Minié ball in the 19th century, which had a hollow base. The Minié ball could be made a loose fit in the bore, just like a musket ball, but the hollow base would obturate on firing -- the gas pressure expanding the hollow "skirt" to engage the rifling. The rifled musket displaced the smoothbore one, and soldiers could now shoot accurately to over 300 yards, instead of 100 tops. That's why the US Civil Wars casualties were so horrific. They started out still using Napoleonic War tactics, but the weapons were 3-4 times more accurate.
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