Thanks Bob.

That is certainly the case with the old bore guns, but what about the express guns? arent they in the same situation as the nitro expresses?

I.E. a 577 2.3/4" can only be loaded up to say 7 drams, and therefore any gun chambered for this cartridge would have been loaded the same,no???

Many thanks, phew this one is a bit confusing.......

Ben