I took some measurements this morning.
The barrel is 30” x 1 1/16 across, no taper. 8 lands and groves. The are deep. The dimensions are 0.446 -0.473 lands and groves, respectively. The cuts on the left side angle Is 1/2” dovetail 4 1/2” long, threaded 3/4” for the breech plug, 3 dovetails on the bottom , two on top.
I purchased this from my Friends estate, he bought several barrels from Bill over the years and built rifles for people. He had a Stroke 24 years ago and never really was able to finish his projects after that. This is one of 3 Large barrels, the others are a 36 cal 13/16” x36 barrel and a very light and long fowler barrel. It is 50 cal and only 7/8 dia, part octagon to round with wedding band. The last two are used. Stocks were broken and he was going to build new ones but never got to it. I picked up other barrels as well. Including two barrels with false muzzles, Two Colerain barrels one of which is a 58 cal rifled C weight 44” fowler barrel! There is a 36 cal rifle with a very light Colerain swamped barrel he didn’t finish. I plan on finishing it but engrave his name on top since to honour him and it will have been 95% by him. We have different tastes in style but I will refrain from changing it.