How was the recoil - Did it 'jump'? 
I'm betting so (but not as much as one might Think, due to the weight..) How far back did it 'plow', at least? Just curious.. Totally Bitchin, Mang. If so, this looks promising as a 'Model' / Test-shot: https://www.rotometals.com/salmon-lead-2-8-diameter-cannonball-sinker-5-lb-80oz/ 
How did you ever find them? Were they Eveready's strapped to a flashlight?
We didn't. We had an unlimited supply of dead batteries because you couldn't burn them in the garage pile.How did you ever find them? Were they Eveready's strapped to a flashlight?
An old friend of mine had a similar cannon to @Aerindel
He shot in the same direction all the time. What was once woods became what looked like a fire break about 40' wide. Got lots of firewood out of it from the trees that were felled by the cannon.
Did you grow up on the moon?My only question is: how much black powder does it consume per shot?
We built small cannons when I was a kid that fired "D" batteries over 400 yards.
We proof-tested them with 3 heaping tablespoons of FF-bp and that recoil would drive the back end into the ground.
(We set them up at a 45° angle for maximum range.)
In the end, how long did it take to cut the pipe?Core is a oil well drill shaft from Alaska. Forged reinforcement rings and straps and carriage parts.
2.75" bore. Firing concrete filled soda can projectiles.
Weight approx 150lbs.
My only question is: how much black powder does it consume per shot?
We built small cannons when I was a kid that fired "D" batteries over 400 yards.
We proof-tested them with 3 heaping tablespoons of FF-bp and that recoil would drive the back end into the ground.
(We set them up at a 45° angle for maximum range.)
BOOOOOOMMM!!! 'Uh, Hunneh.. I don't think that thar was a 12 gauge..'
Awesome.
Sheriff (or anyone else such-like) show up?
jd
MT (and AZ, and ID, for that matter) are the way things Should Be, when it comes to '2A-codified Rights'.. 
Ya'outta Bring 'er down sometime.. 
