Originally Posted by Evil Q
And yet the law-abiding citizenry was trusted to keep and bear arms that were equivalent to the best that the military had at the time. Not so, now.
As to the accuracy statement; well, inherent accuracy is directly proportional to barrel length, rifling twist rate and projectile weight, now as it was back then, so I'm rather skeptical of that statement, as the laws of physics do not change. In the end, any projectile weapon is only as accurate as its wielder anyway.
I believe you forgot projectile shape, speed, and material, as well as the fact that musket barrels weren't rifled. Plus, when you can fire 50 rounds in the time it takes another weapon to fire one, your chances of hitting your target go up quite a bit.