Dave,
Thanks for your comments and historical perspective. For some reason, the standard Pecatonica Tennessee Classic stock is inlet for a Siler, so I went with that. If I make another Tennessee I'll try the later Ketland. I have no complaints with the performance of the Deluxe Siler though. Ignition is very fast and reliable. The position of the cock at half cock is a bit odd however. At 7 lbs this rifle in .50 caliber is bit lighter weight than my others and while I like the visual lines of this gun, with its deeply curved butt and sharp points, recoil with my usual hunting load can be a real attention getter if not properly mounted. I am now anxious to see how the .40 will perform. It should be ready for field trials in time for the Spring Turkey season.
I am thinking the next project may be an Isaac Haines 38" swamped barrel with sliding patch box and silver wire inlay. I am finding that to be another rather handsome fire lock.