Hence my comment about finding a real live person mentor to start him out the right way.
Blow-ups are so very rare that whoever did it just has to be some kind of don't-give-a-sh*t dwong.
The loading data figures are all right there in front of you with the matching propellant.
Blowing up what is generally reckoned to be one of THE strongest action revolver on the planet really must have taken some tremendous effort at ignoring ALL the rules.
To the OP - start by learning the SIMPLE basic and reloading that easy straight-wall revolver cartridge - the .38 Spec. After you get confident that you know what you are doing with that, you can progress onto the more complicated rifle cartridge - and it is a LOT more complicated.
Remember that the figures in the loading data handbooks offer a MINIMUM load as well as a MAXIMUM load. Ignoring either figure is something only the terminally stupid would do.
These data are not a subject for discussion - they are the RULES by which you can safely make something that is going to go bang at 20,000 pounds a square inch right there in your hand, or right up against your face. Isn't it worth sticking to the books to do it safely?
tac