Calibers during the Revolution?

[smoothshooter]

As a lot of people have said, definitely north of .50 for the most part. I happen to know that my ancestor Daniel Boone's rifle was probably about .68 cal. He used a Pennsylvania Long Rifle, so it can be assumed that most civilian rifles were around there as well. But, as for civilian firelocks, most of them weren't really "models" as we consider them today. Most guns, and their calibers, were dependent on the whims of the gunsmith. The caliber depended on what sized mandrel they used. Size, length, pattern, all varied greatly from gun to gun. Military muskets were the only ones that were consistent, and there's a lot of info out there (Charlevilles were .69 cal, Brown Bess was .75 etc.)

Boone would have owned many rifles and smoothbores in various bore sizes over the years.
Frontier life was hard on guns due to boating accidents, theft, weather, mishaps with horses, etc.
Remember that Boone was captured by Indians more than once, and lost his gun(s) to them least once.