A British officer, admittedly from the time of Marlborough but still referring to the smooth bore musket that hadn't changed that much by the time of Napoleon:
“A soldier’s musket, if not exceedingly badly bored, and very crooked, as many are, will strike the figure of a man at 80 yards – it may even at 100 yards. But a soldier must be very unfortunate indeed who shall have been wounded by a common musket at 150 yards, provide his antagonist aims at him; and as to firing at a man at 200 yards, you might as well fire at the moon and have the same hopes of hitting your object. I do maintain, and will prove whenever called upon, that no man was ever killed at two hundred yards by a common soldier’s musket by the person who aimed at him…and in general service, an enemy fired upon by our men at 150 yards is as safe as in St Paul’s Cathedral.”
So men being hit at 1600 paces must be the unluckiest ever to have been born! This is why the British infantry commonly marched to within 60 paces of an enemy before giving him fire, and then, before the smoke had cleared from in front of them, charge home with the bayonet.