Machined out of 17-4, 1.25" bore, shoots a 9.9oz miniball. My father has been a machinist most of his life and started it about 15 years ago then had it sitting in his closet collecting dust until I reminded him that I wanted it.
It was a blast to shoot and can't wait to cast a few more rounds for next time. I tried retrieving on of the rounds but it went to deep into the birm to get without a shovel.
it was shot with 300 gr of PYRODEX RS in prepared aluminum foil packs, then a lubed miniball on top and tamp down well, puncture foil, add musket cap, pull string and BANG!
This will be my sons one day too.