If you can find the Remington, or other USA-made, industrial plastic cases, then I have a quick method to remove the “belt” at the base, though you’ll need your machinist to spin up a simple little tool for your drill press.
As to 8 bore effectiveness, I took a smooth bore double hunting in ‘95. My PH wasn’t keen on my shooting a buffalo with a smooth bore round ball. I suggested we go Eland hunting.
We jumped an Eland running near straight away at a slight angle. As I threw my smoothbore up, he reached over to push my muzzles toward the ground. He thought better of that, and I shot the Eland running away at ~65 yards (920 grain round ball, 1650 fps muzzle velocity) in the left butt.
The round ball penetrated the Eland end to end, breaking the offside humerus. It tumbled end over end and was dead by the time I could run to it.
He said, “Young Robert, you can shoot anything you want with that smoothbore”.
It worked fine on buffalo and driven guinea fowl with little 2.5” shells loaded with 7 1/2’s.
The full length plastic cases holding (22) OO or OOO (I can’t remember…don’t wanna lie, but I think OOO) buffered buckshot were very impressive on a paper target. I never used them, otherwise.
In a hallway they would have caused some serious devastation.