Not trying to sound smart here or anything, just a thought. What is the possibility that the batch of powder used with this load is burning weaker than it is supposed to? I have seen huge fluctuations in powder batches being put out by Somchem (South-African propellant manufacturer that exports powder to some of the major US powder manufacturers). I usually check batch numbers on containers and then buy a bunch of containers with the same batch number put out by the factory to get consistency with my loads.
Personally I have never gotten close to that much over max but maybe Clarkm got a real bad batch of powder that is not igniting as it should?
Pieter
