It is considerably more powerful than the 50-70 as the case is .350" (9mm) longer. Also, there is no levergun currently available that can handle 50K PSI.

Right side...

An old photo, before the stock was fully shaped, inletted, and finished.

The modified magazine can be seen on the left. The sheetmetal was removed from the sides and straightened, then re-pinned and brazed. I will take some better photos soon.

The receiver was a 1915 Peter the Great arsenal (Tula) M91 with the Czarist eagles scrubbed and a bad barrel. No SA proof from Finnish capture, and missing the handguard and a barrel band. I had no qualms about using it for this project.