It sounds like you might profit from viewing George Shumway's two volume set, titled "Rifles of Colonial America" and Joe Kindig's "Thoughts on the Kentucky Rifle in Its Golden Age." These have history, photographs and measurements of many guns of a wide variety. There are a number of other worthy publications on this subject and they are not hard to find. If this information isn't satisfactory, you might give us a better idea of what you are after. There are several folks here who can provide authors and titles on until next week.
Dick