Rifling the Model Armstrong 110pr Cannon.
by John
For reasons which I will not detail here, I am spending more time at home, and much less in my workshop. Work on the Armstrong 110 pr breech loader is progressing, slowly. However, the rifling is complete.
I detailed the rifling setup in a previous model build, but in case you missed it……



The setup took several sessions to complete. I had previously drilled and D bit finished the bore, and drilled and cut a large thread to accept the breech screw. Then I turned the exterior of the barrel so it would fit the jig. It will be turned to its final shape in a future session.
I could not find actual specs for the twist, so I randomly decided on 90º. The cut started in the powder chamber and finished just beyond the muzzle. The rifling in the original started distal to the projectile chamber, but I had to ignore that due to limitations of my setup in accessing the adjusting screw. The powder chamber and projectile chamber were slightly bigger than the bore in the original, so I might be able to machine away the unwanted rifling in those areas in my model.

Nice job on the rifling! I wish I had your CNC setup when I did mine. There’s a chart on page 271 of the Treatise on the Manufacture of Guns and Textbook of Service Ordnance that says the 7” Armstrong has a twist rate of 1 in 37. The barrel length is 99.5” long so it looks like the shell makes ~2.7 revolutions before leaving the muzzle. I made mine 1:26 because the Greenhill formula indicated my aluminum bullets should stabilize which they did.
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Great work John keep posting when you can.
John Emery
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Thanks John.
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