From 1492 to cr 1700 rifles were few and far between in America. Smoothbores were the go to. Even by 1750 even hard core longhunters were more often than not sending ball home from a smoothie.
Rifle guns were popular after the revolution, in parts of America, not too much in Canada. When the fur trade started in the Rockies it was said French, Indian ( eastren tribes men who came to work our west) Mexicans ( that included the Spanish population of Louisiana, plus guys out of New Mexico) all shot a fusil, while ‘Americans’ wanted a rifle.
You bought a rifle you got a mould. You didn’t try .526, .527, .530, .535 in your new gun.
Powder charge was rule of thumb. Cover a ball in the palm of your hand with powder.
You didn’t try five grain differences until you got the best load.
Boone liked 400 count linen but I bet most people patched with what ever the trader had, or old shirts and pants.
This is our sport.