SGTCOFFEE,
According to Murphy and Madaus,s book (which you mentioned), James L Cauthorn & Co. delivered a minimum of 71 rifles under contract to the state of Tennessee between December, 1861 and February, 1862. These were listed as "Harper's Ferry" rifles, with four described as "Miss. Rifles".
James L. Cauthorn appears in 1850 census of manufactures in Tennessee with five employees and an annual product of 80 rifles valued at $1700.00.
James L Cauthorn also appears as a gunsmith in the 1860 census of Cannon County, Tenn.