The only rifle I know of that can handle the pressure of the modern Magnum in a falling block action is the B 78/1885 browning or the Ruger #1. Most if not all of the repo,s are designed for black powder pressures and should not be used for pressures exceeding 48,000 psi.
The B-78/1885 is my favorite action for this use and is more than capable of handling pressures of 65,000+ psi. I have owned three one in 30/06 and one in 7 rem mag and the other in 7 STW. The 7 stw had a 31" barrel and was more compact that most bolt actions because of the short action of the Browning. It would propel 140 grain bullets beyond there limits (3800 ft/sec).
I love my 1874,s but they do have there limits because of materials and design, and I don't want to damage ether with excessive pressure. Some will say it's ok but you are using up any safety margin built in
to this design.
J E CUSTOM