The T/C PA Hunter has a 1-66 twist barrel. While they are not a fancy rifle, they are a nice looking rifle. And it being a flintlock does not surprise me as most of them were made with the Pennsylvania primitive seasonand traditional shooters in mind. They are a very accurate rifle. They are a roundball shooting rifle. And normally a powder junkie so be prepared. I would load it with 90 grains of Goexand a .490ball with a .015-.018 patch with a good quality lube on it. Prime the pan with Goex 3f or 4f. A good sharp flint, and you will be in business.
As for being a rifle that might be too valuable to shoot? They sell for around $300.00 on auctions.I would never sell it since my father built it, if only for that reason. Plus being a hand me down from Dad would make it a stay in my gun rack til I die rifle.
To shoot it, get a cleaning jag, short starter, some quality black powder like Goex 2f or 3f both will work. If you get the Goex 3f you can shoot and prime with the same powder if you like. Some Thomas Fuller black English flints in 5/8 thick width will fit the lock perfect. Or you can go with Agates and do the same thing. Some .490 roundball, patches, lube, alcohol to swab the bore and wipe the frizzen and flint off with, a vent pick, and you should be about set.
Swab the barrel with a very lightly dampened isopropyl alcohol patch and then two dry patches. The bore should be dry now. Take that alcohol patch and wipe the frizzen, pan and flint off. Check the flint to make sure it is good and sharp and not all busted and blunted. Then start outby dumping 80 grains of BLACK POWDERdown the bore. Place your lubedpatch over the muzzle. Center you ball in the patch. Now with the short end of the short starter, set the ball under the muzzle. With the longer end, seat the ball into the barrel. Now with the ramrod and the correct jag, set the ball onto the powder charge. Prime the pan with about half a pan full of powder (3 grains), trying to keep the powder away from the vent hole (so you do not get a fuse effect). Cock the hammer and pull the trigger when ready.
Your world will change forever when you see/hear the flash...BOOM!! If you did it all right, the ignition time will be very quick and the ball will be sailing down range to the bulls eye.