Go to a sawmill that cut ties,You can get them $35.00 a piece, Back doing WW2 when there was a push to turn in iron why some towns turned in there civil war cannon barrels for iron for the war, Some of the guys in junk yard here in town took one barrel and loaded it up and they put it against the railroad tie on the tracks, It blowed the tie of the rails, Back in my home town in Lancaster Wis. They junked out 2 big field pieces that had 10 foot barrels with the cannon balls, Make you scream now.
I found out today they were fortuss guns on swilve base, Will find out more, Will ask the old boys in the old folk home.