I have a Marlin 1895 with a Williams Foolproof peep sight. With the 45/70 you really need to reload to utilize the power capability of the rifle you have.
I saw one on the wall of a gun shop in Tulsa, OK forty three years ago.
It was a Winchester 1894. Now, Winchester never made a 45-70 for the 1894 so I asked about it.
It was handmade by a professional gunsmith to see how it would do in that caliber. The owner refused to fire it as it was still a very light rifle.