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G'day 9.3x64,
I am building a 577-500 No2 on a large frame Martini and have the reamer and Go gauge.
I got my dies from CH4D and they had them on the shelf!

I will fill a case with water and let you know the capacity. I have to do it so I can use Quick Load to work out my safe loads.
I'll be using PP 580gr & PP 500gr bullets, from my own moulds. I made the mould so I could test Jeff's 500 NE, Ruger No1, a couple of years ago.

Will post more pics later, if that's ok with the OP?

Any more detail on your rifle & load AFRO408?
My mate contacted the double owner but he rejected all our help.
Such is life.