Nameless, if you or others are interested in SMR and TN rifles you are fortunate because a number of new books have been written about them. SMR's have been getting a lot of attention from collectors in the last few of decades. Probably because the nice Pennsylvania rifles got so expensive, while the SMR's were very affordable, relatively speaking. Several collectors have conducted research and written books about the rifles in their collections.
Here is a list of some of those books for those interested with links where you can buy them.
Kentucky Rifles of the Great Smoky Mountains by Randal Pierce
C. Michael Briggs has published several books on North Carolina gunmakers.
The Longrifle Makers of the Salem School may be the best of the bunch. The link will give you more details on the book and has information on ordering it and the other books by Mr. Briggs.
The Gillespie Gun Makers of East Fork NC by Dennis Glazener is another book worth considering. As the title says, its about a specific family of North Carolina gunmakers.
The Kentucky Rifle Foundation has CD's that one can order with detail photographs of rifles. There are two CD's on the subject.
These resources won't give you a simple straight forward answer to you question, but studying the guns, the people who made them, and when and where they lived may provide partial answers. At a minimum, it will give you a greater appreciation for these rifles and where and how they fit in the story of the American longrilfe. Something I doubt you will ever get from the internet.