Craig, yes I have also read Tom's reviews and I will agree there is much to know in reloading. I have also seen a powder that just substituting a primer only changed it a few hundred psi.

There is a lot of information on reloading on Shotgunworld in the Reloading section, many have had loads tested and have shared their results. Most all will agree that shooting in the 8,000 psi range, a primer substitution will not bring you close to SAMMI's pressure for 12 gauge which I believe is 11,500 psi.

I do have to agree, that his load was high for a vintage gun no matter if a Damascus or fluid steel barrel.

David