Bob, a "Hindenburg" in context of Quigley guns looks a lot like the pic below. Your 625 grainer would qualify.
If you don't mind, the .442" diameter seems a bit smallish to me. What's your finished diameter when patched? Asking because I have minimal experience with patching for BP guns and what I've done used cross strip patches so the dims were quite a bit tighter. Wrapped patches that I've done were for smokeless and for a .44 Mag. Bullet is .422 and patched to .430" final w/9# onion skin.