i want to build one, does anyone want to go in with me and offer this guy selling it to send us more pics with messurements of everything in scale i will compete with it in the NSSA i wan one really bad. i want to build one.
let me know
You don't need measurements on everything. Antique Ordnance puts out a book on them with lots of drawings. They do have list of questions not known about it. I have that book and will be home tomorrow or Thursday and can post them. I also do have a repro of this so can help with barrel measurements. Mine is on the first model prairie carriage. It would be great to see carriages made properly.
I know one thing that would be great to know is the placement and size of the holes for the rear sight. There is next to nothing known about them. Perhaps the dimensions could be matched to other sights. From the placement, it looks like Chapman made a good guess for their mount. They used a modification of a naval Dahlgren sight for the part to insert into the base. I don't think this is quite as good as the pendulum hause sights for long distance.
The liner in mine was made by a fellow named Ken Kurdt. He's supposed to be the one who does liners for Steen and maybe others. It is a beefy piece of steel and the muzzle end has almost no brass and almost all liner.
If you actually do this you might want to consider how authentic you want the interior to be. The rifling is 3 groove sawtooth with a 1 in 120" twist. When I plug this directly into Greenhill I get an ideal projectile length of 6.2". That is suicidally long for a lead projectile. Perhaps more grooves with a different twist could allow shorter projectiles.
Steve