Great .44 story and success.
Have been hunting with a 45/70 for a number of years, but a couple of years back I bought a slightly used RUGER 77/44 from a down sizing friend and then did a lot of testing to find a good load with a 280gr Wide Flat Nose bullet I cast for my son's .444.
When it was time to quit testing and get ready for hunting season this past Fall, I was getting about a 3" - 100yds group at 1750fps.
Want better groups, so have a new 240gr WFN mold that I've started loading test round with, the test rounds waiting for Spring/Summer.
But, my Fall hunt with the .44 filled both of my deer tags. Both one shot dead right there and full penetration, one side to side at 95 - 100yds and the other at 50 +/- yds. through the neck bone and on through a shoulder blade and gone.
Come next elk season, I'll be back out with the 45/70 to see if I can bring home elk number 4 with that rifle, but for sure the little .44 rifle will be out for deer season.
Crusty Deary Ol'Coot