Interesting request,
I had one, once upon a time. Sold it before I shot it. Lucky to lose just some of my money. I worked on a Chaparral Short 1876 rifle, with the 22" barrel ( the best part of the gun), in 45-75 caliber. Fell in love with the 45-75, wonderful caliber. I worked on it around one year, even replaced everything I could with original Winchester parts. Still was unreliable on shooting an entire magazine. Every 5th or 6th round failed to go off. Pretty much sucked. Took a big hit and was lucky to sell it. The buyer understood the problem with the gun.
I figure you know what your doing. Good luck if you find one.