I emailed TVM about this rifle and this is the response I got:
"
Good Morning Mr. (Elmer),
The Leman rifle in your photo was build for Mr. C---- in the first quarter of 2002. It has a Siler Mountain percussion lock and #4 Davis double set triggers. Loads for that rifle you can start at 50 to 60 grains 3f powder , .490 round ball ,15 to 18 thousandths patch. Shooting your powder charge should settle in around 70 to 75 grains.
If you have any other questions please feel free to drop us a line.
Thank You,
Rod"
Names changed for privacy.