A vent liner is historically correct....for a very expensive European gun. And then it's gold or platinum. It is possible, of course, that some American gunsmith, probably in a coastal city, might have made a FINE gun with a gold liner for a wealthy client. Otherwise, no, they're not really historically correct. :wink:
This is a used, but not abused gun from the 1720 range, more or less (the lock is very worn out). The touch hole is fine . I haven't measured it, but looks about 5/64". Probably not quite 3/32". It is coned on the inside. The base of the cone is probably close to 1/8"...maybe 3/16". :wink:
Yes, there are period references to the tools used to cone touch holes. In the Journal of Historical Armsmaking Technology (I forget which volume, I think it is III), there is a treatise by a Herr Sprengel (I forget his first name, I don't have it in front of me) on gunsmithing. Kind of an overview, possibly used to entice youngsters to take up the trade, and for the general instruction of the public. He shows a hand cranked gizmo with a little cutter for cutting the touch hole cone. I would really like to make one for myself...someday. Someone on this board did make one, and it's pretty cool.