I cast a 255 WFNGC for my SBH 41 Hunter,this is a custom mould designed for the SBH cylinder ,noselength on the bullet is .420 and it has a gas check .With H110-22.0gr 1340----24.0-1450( MAX)
These are cast with wheelweights.Hope this helps.
What revolver are you shooting??What is the noselength on the 260gr bullet??
Sean