The 25-35 is rated at 44,000 PSI or 37,000 CUP by SAAMI. Correct bullet diameter here is .257 - .258. The cartridge is pretty much a has been over here, at least in my area.

I couldn't compare it to CIP specifications because all my searches turned up for 6.5 X 52R was the Carcano cartridge. Certainly the specs. are out there, I just don't know how to find them.

NRA Benefactor 2008
NRA Patron 2007
NRA Endowment 1996
NRA Life 1988