I think the appeal of the siamese mauser was exactly to get a 45/70. If the 450 Marlin had been available, I dont see that much different than availabily of belted magnum brass that is easy peasy to make a 458 2" American. There is a limitless supply of guns that can handle the American. The Marlin is an annoying idea. You have triggers designed by lawyers, then there are cartridges designed by lawyers.
We will never know.
