Hi,
Merry Christmas!
There is a good book with great pictures, dimensions, and information, the book title is "For Trade and Treaty by Ryan R. Gale ( highly recommended )
I am building mine mostly from scratch. The only store bought piece is the lock.( Davis trade gun lock )
It would have been cheaper ( in time dollar value ) to purchase the gun parts, but I wanted to see if I could do it.
Great venture!
Making the butt plate from 1/8" brass, making the barrel from seamless DOM tubing ( 5/8" bore ) making the trigger guard from 10 gauge flat stock. Now to make the ram rod and ram rod pipes.
The pictures from the book mentioned above helped very much.
Cutting and inletting the stock from a walnut blank is easy.
Building these guns are no less labour intensive than regular long rifles, the end finishing is much less though.
Trade guns were made with 36" and 48" barrels. I chose to work with a 36" barrel ( I'm older!)
It was fun making the trigger guard, working from a 2" x .110 X 11 3/4" flat stock. Then cutting the flat stock back to 1" width and 1/2" width was easy enough with an angle grinder. The end result is a rather crude trigger guard.
I would prefer a more refined trigger guard, as there is on a long rifle. But to follow style is what it is all about.
A smooth bore is a lot of fun to shoot. Fast reloading is easy with these guns, and they shoot almost anything you can cram down the barrel.
If you jug choke the barrel you can really tighten up the shot pattern. Also using plastic ( yecht ) shot cups, ( card board cups work better) really extends your reach. A traditional load of powder, wad, shot, and card really gives a very open shot pattern limited to twenty yards ( or less ).
If you are going to shoot, ...............shoot well and hard, get all or most of your lead on a tight group at thirty five to forty yards.
There are several cost saving items on traditional trade guns that I do not like, ie: the nails in the butt plate instead of screws, cheap and simple thin gauge flat butt plate. And most of all is the poor fitting screw ( bolt ) passing at an angle through the trigger guard, and stock up into the barrel tang. ( guess it was cheaper at the time, but not very appealing to the eye )
A gun of this power and potential coming in at under six ( 6 ) pounds is very attractive.
I made a New England fowler two years ago, the bore size was the same ( .625" ) 5/8" but the stock was much more graceful.
So have fun in your journey of black powder shooting, it is a great past time. I only wish I had a few more years to enjoy it.
Fred