Back in the early 80's my son was in college . This was one of his machine shop projects .
Wonder If I could bore a fuse hole and try it out ? The barrel is made from a tank track pin . When I went through the machine shop class back in the mid 60's they had a ton of these track pins in storage . Amazing that they had lasted than long . The machine shop class required a project that used milling machine , old shaper , knurling , etc. My project back then was machine table jack stands . The college kept them . I wanted to keep them but they said they needed them . :<( I made a ball pien hammer from the track pin and also a slide punch for sheet metal lay out , I did get to keep them.
I marked the end /bottom of the bore , it is about 1" behind the trunion pins .The trunion goes all the way through the tube.
The ball would stop on the trunion , would the barrel be safe to shoot with low power FF BP charge ?