Tom, with all due respect, I remind you that the earliest record found in Tennessee for Joseph Bogle (Jr.), was his marriage bond, dated January 1786 and found in the Greene County records. According to the records, Jos. was married in what is now Green County, Tennessee, on January 3, 1786 to Margaret (Peggy) Houston, the daughter of Sam Houston. That date would be consistent with the arrival of the McTeer family in Tennessee. The Bogles and McTeers were, as you know, neighbors in Pennsylvania, then Virginia and then in Tennessee. The McTeers and the Bogles attended church together at Eusebia Presbyterian Church, which was established in 1786 just one and one-half miles north of McTeers Fort, which was established about 1784.
Since the gunsmith Joseph Bogle (Jr.) appears to have arrived in Tennessee in the 1784-85 time frame, the earlier rifle bearing his signature, which you rescued and brought to light, was most likely made after he was in Tennessee, unless the rifle can be dated prior to 1785.