Howdy all, Quick, thanks for the reference.
I no longer have the BC but am seriously considering another. They are just plain fun to shoot.
On the tang issue, I don't think it's the BEST setup, BUT it was accurate. I talked to Lee Shaver (he did mine) in depth, over the phone about this before doing it. He was very helpful and is a very knowledgable singshot riflesmith. Lee and I agree the best setup is a sight on the barrel, but the next best is a welded tang, on the back of the receiver. Then cut the inlet out of the stock. You still have SOME variance, depending on how tight the breech closes, but it's a bit more stable then the wrist tang.
My current thinking is going more towards something like this
mounted on top of the barrel. Still very period looking and should be very reliable and accurate.
Something like this from Brownells can be mounted right on the barrel too.
Here is the link.
http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=12783Not as nice as a peep, but workable.