So Larry... your pet load seems to be loaded closer to CIP maximum than SAAMI maximum. That was my point in the context of the discussion, not that it's terribly relevant.
Neither CIP nor SAAMI member companies 'load below their rating' for liability reasons. That's one of the purposes of the standards in the first place. They are quite free to load right up to maximum peak pressures, and certainly sometimes do.
We were trying to figure out what the pressure might be at the apparently arbitrary 162mm point which is about 6 3/8" from the breech face and not the 9" quoted in this and other discussions as the mythical 'peak pressure point of a second proof load'.
The intent is clearly to test not only the chamber but the forcing cone to a reasonable distance.
