The pressure levels for the 45-70 are well known yet Wild West Guns makes an altered for length only version of the Marlin 1895 called the 457 Wild West Mag that operates at 45,000 CUP..Do the conversion and you will be right at 48,000 PSI.
When a Marlin blows up,it isn't from just one round over pressure,it is usually from a barrel obstruction.Test were done by Freedom Arms for the 454 Casull operating at 65,000 PSI SAAMI with the Winchester '94 and Marlin '95..The Marlin failed first at rounds in the 62-63,000 PSI level with just 20 rounds through it.
It did not "Blow Up" it just broke with the action mangled to where it would not function anymore.
Jayco
And the tiny little model 1892 Browning design Winchester handles 454s just fine in the Rossi/Puma. Old JB knew what he was doing!
