I talked to Jason at Rice Muzzleloading Barrel Company yesterday concerning whether, or not, he would still rifle a barrel in .62 caliber with Forsyth-style lands & grooves. I called because my curiosity had been aroused due to BS's posts here in this thread, his posts over on the ALR forum (user name Bsharp) about his Forsyth rifled .62 caliber rifle, and the posts in both forum's FOR SALE sections over the past 6 months where someone was trying to sell off a Forsyth rifled .62 caliber Rice barrel.
The answer was yes. The cost was $395.00. Available in ONLY .62 caliber. PERIOD. Don't call asking about other calibers, as he doesn't have the tooling to do them.
He is willing to cut Forsyth rifling in .62 caliber in any barrel profile as long as several things are kept in mind. The waist measurement MUST BE at least 0.125" for the barrel wall thickness. This is non-negotiable for the strength required to handle 200 grain powder charges.
In a similar vein, if you want a swamped barrel profile, then a breech diameter of approximately 1.1875" octagon is going to be the minimum he will consider. This will depend upon the profile selected, and the length of the breech section starting at the threads.
For instance, he mentioned the Early Dutch Lancaster profile barrel which ordinarily has a 1.312" diameter breech. He would reduce that to 1.250" diameter for a Forsyth rifled .62 caliber bore with 0.006" deep square bottom grooves, and a bore diameter of 0.632".
The Early Dutch Lancaster profile barrel is shaped like this......
Breech = 0"
End of first taper = 9" (+9")
Beginning of waist = 23" (+14")
End of waist = 36" (+13)
Muzzle = 41" (+5")
The Early Dutch Lancaster barrel rifled in .62 caliber with Forsyth-style lands & grooves might look like this......
Breech, 0" = 1.250"
End of first taper, 9" = 0.980"
Beginning of waist, 23" = 0.890"
End of waist, 36" = 0.890"
Muzzle, 41" = 1.000"
This would give barrel wall thicknesses at the following locations of.........
1/2" from breech (clear of threads) = 0.3015"
9" from breech = 0.0.174"
23" from the breech = 0.129"
36" from the breech = 0.129"
41" from the breech = 0.184"
If someone just wanted a straight octagon barrel, then I think Jason is going to make the barrel in a 1.125" diameter, with a barrel wall thickness of 0.2465"
Anyhow, you get the general idea. A .62 caliber Forsyth rifled barrel is available in a swamped octagon profile from Rice at a starting cost of $395.00. Straight octagon, which I did not ask the price of, will cost less.
Jason has a proprietary, CNC machined, flint, Nock-style, hooked breech plug in the computer to be offered with the 4140CM steel, Fast Twist, .45 & .50 caliber, 15/16" & 1", drop-in barrels for Thompson/Center rifles. He's been holding off working on it, and offering it with the Thompson/Center barrels due to a lack of demand.
This would be a perfect breech plug, with a fixed tang, to be offered with one of these Forsyth rifled, .62 caliber barrels. If anyone decides to call Rice about a Forsyth barrel, PLEASE, PLEASE mention the CNC flint breech plugs to Jason. It would be great to have a high quality flint, Nock breech plug available for a Rice barrel.
Rates of twist can be from......
104"
95"
84"
72"
The number of grooves & lands is 8 each. As shown on the muzzle's image on BS's post/thread over at ALR. If my calculations are correct, the lands measure 0.04867" wide, and the grooves measure 0.19468" wide.
Thanks