I made some more progress. I've got the tang shaped, bent, and inletted.
Line from the top of the breach down to the wrist to give it a more immediate curve downward. A profile now looks correct in that area, where it didn't before.
I cut the Tang to length, having it terminate just before the nose of the comb. This makes it about 5.75 in Long. That's longer than the beckwourth rifle, but is is hidden behind a wrist wrap and I want to make my wrist as strong as possible; I also plan to bolt through the end of the Tang into the trigger plate.
I then shaped the end of the Tang to round by scribing a circular line with a compass meeting the outer edges of the tang. I then filed it round using my scribe line as a guide. I believe the Beckwourth rifles Tang is flat at the end, but once again that one is hidden under a wrist wrap and I wanted this one to be round.
I bent the tank cold using what seems to be the most common method, putting the Tang into my vise and then using the barrel as a handle to bend it. I did quite a few series of bend and check alignment to get it pretty close to my line.
Then inletted the tang. I sat the breach bolster on top of the stock on the center line with the muzzle and down in the channel. I marked with a sharp pencil around the edges of the bolster, stabbed in just inside the line, and started removing wood. Once I got pretty close to the point of having the Tang rest on top of the stock, I used some color transfer to even up the sides of my mortise and ensure that it was centered with the barrel channel. Once the Tang was resting on the stock, I used a sharp pencil to outline the tang and then stabbed in along the insides of those lines and started removing that wood until I was close to final depth. Then started using color transfer on the bottom of the barrel near the breach and the bottom of the tang and the breech area and breech bolster area. Once I got close I started checking the contact between the barrel breach and rear surface of the breach plug bolster try to keep that contact pretty even across the back.
I'm now at final depth as indicated by the contact between the barrel and the barrel channel. There is no contact that I can see at the bottom of the reach plug bolster and the very forward part of the Tang mortise because I realized I was tapping on my barrel too hard with my mallet and it was allowing the tang and barrel to bend just enough to where I would get false contact and those two points and I ended up removing too much material. But, I have good contact everywhere else. And I think my contact is pretty good between my breach and the recoiling surface of the stock.
Do you see any reason to continue going to get better contact anywhere?
Please ignore the blue. That stuff isn't coming off, unfortunately.