Unspellable:
My point exactly!

Rusty:
I would ask the question "Why would you need to?"
The single most important line of text in Graeme's book IMHO is where he states that, if you use medium-slow modern nitro powder and don't exceed the old cordite published velocity, the load should be safe, ie below the original cordite pressure for which the gun was proved.

Personally, I accept that statement as absolute fact, given a sensible approach to fillers if required, and correct bullet weight and diameter. In Australia we also have the luxury of ADI powders, something we generously share with our American buddies through Hodgdon's 'Extreme' range.