Rifling a barrel-ever heard of this method?

[bob in the woods]

About 20 years ago, I read an article in Muzzleblasts magazine re rifling a barrel , but the method used was different than others I had heard before or was aware of. I had to try it, and used it to make a pistol barrel.
Unfortunately, I have misplaced that article, and haven't been able to track it down. Perhaps someone here is aware of this method??     2 pieces of angle iron , and a length of keystock are the main components, along with the cutter and section of hickory rod.  There are square holes drilled/filed in the angle iron sections ; one off set from the other. These are clamped down on a bench and as the piece of keystroke is drawn through them, you have your twist [rate is dependant on the distance between the angle iron pieces]   This works for cutting one groove at a time since the barrel needs to be rotated to cut the next groove.

[Daryl]

Is this not the sine-bar method, performed vertically or horizontally?

[bob in the woods]

Horizontal...on my work bench.  The draw back is that each groove must be completed before moving the barrel and beginning anew.  The attraction was that there is very little work required to get up and running. Very simple

[KNeilson]

Is the key stock twisted?

[bob in the woods]

There is enough "give" in the key stock to follow the twist dictated by the off set hole in the angle iron
Imagine a square hole in one, and the other has the square off set i.e. rotated by 25 or more degrees.  It depends on the distance between the angle irons when clamped to a bench.

[KNeilson]

 Why I asked was I was comparing to what I made up to do the same thing...  fits in the steady of my lathe, Ive made several bars for different twists. btw, the machine design where the rifling rod is motivated by a twisted or grooved shaft is called "leader bar"  Those are skateboard bearings bolted on 1/2 sq stock welded to bit of 2.5 in pipe, and twisted 5/8 crs keystock. Made up in an afternoon

[kutter]

I visited a gent one time back in the 80's that built M/Ldrs and made his own bbls. He rifled them with a simple set-up that employed a  square bar of key-stock that was twisted and ran through a square hole in a steel plate. The key stock was not all that big and was simply twisted by hand by him. I don't know how uniform the 'twist' actually was but it appeared quite so. The barrels were single point cut. He would alter the # of grooves by placing the barrel being cut in blocks  of square, hex or oct shape to get 4,6 or 8  groove rifling,, turning the bbl & blocks assembly after each groove was complete to the next flat on the block.
They shot very well!.