Straight wall cases dont exhibit the same signs of pressure that we generally get with bottleneck cases, so IMO it is best to use pressure tested data to keep safe and obviously cross check the data in case of errors. There are plenty of instances where Marlin 1895's have been damaged through what appear to be reloading mishaps. The ones you see on the net always seem to blow up at the front of the receiver where the receiver wall is the thinnest, ie the area between the bottom of the barrel and the top of the magazine gives way here. The 450M not only uses V threads, but the case head fits in a smaller mag tube and the cut outs for the loading and ejection ports are smaller, which leaves more metal in critical areas compared to those chambered in 45/70.
If you review pressure tested 45/70 load data it becomes clear that there is little additional performance to be gained by bumping pressures up 10-15K psi (maybe 100-200 fps). Personally in such a light rifle like the 95 Marlin, loads developing around 30k pressures provide all the performance (and recoil) I need in a package like this (400 gr at 1850 fps).
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