Yes, but a man armed with a smoothbore musket could go quite a bit of that distance while he was reloading, and with two or three of them he would really be in trouble. French skirmishers could reload at the double, striking the butt on the ground to seat a loose ball. The riflemen were specialists, depended on numbers, cover and distance, and in Spain at the least, they were often distributed at a company or so per line division.
The term "line", for ordinary infantry, is an eloquent one. The British army was exclusive volunteer in the Napoleonic, if you count a judge or magistrate sometimes offering an alternative. Commanders like the Duke had to conserve their lives except in the most drastic need, and remained capable of standing in line of battle right up to Waterloo, and firing and loading in two or three groups. Organised volleys offered the best chance of windows in the smoke. Napoleon started out with badly disciplined revolutionary armies and later conscripts, with many of the former regime's officers guillotined or travelling for the good of their health. That is why his men advanced in rectangular columns, with the front few ranks intended to be expended, and he disliked small-scale skirmishing, which Spanish guerrillas did rather well. He actually withdrew the few rifles the monarchist regime had used, but with his material and in his situation, it wasn't bad logic.
You would probably like CS Forester's "Death to the French", which is the story of a Rifleman Dodd who is separated from his unit, and becomes a leader of Spanish guerrillas. He isn't a man of unusual intelligence or unusual courage, but he has been taught to make the best use of what he has got.
The 60th Rifles were raised as the Royal Americans in the Seven Years War, and although by the time of the American Revolution they were mostly British, served very creditably there. In 1914 they were considered a loophole for Americans who wanted to get into the First World War early. I don't know if that had any validity in law, but they didn't ask too many questions at the time.