To get back to the original question, P.O. Ackley's tests are reported in his Handbook for Shooters and Reloaders, Vol. 1. I don't know if it is still in print, but used copies are around. The trouble is that the results are about worthless. He proved that rifles will blow up, something most of us already know and that people knew then. He had no pressure taking equipment, so comparisons are not possible.

He did not use any discernable methodology, simply setting out to find a load that would blow a rifle. The results are interesting in showing HOW rifles fail, but of little value in showing at what point they fail. He might blow up one gun with A grains of B powder and another with C grains of D powder, proving nothing except that those particular loads would blow that rifle. He even used heavy charges of 2400, which would probably blow any rifle ever made except possibly a Remington 700, and likely would harm it.

I don't doubt Ackley's basic findings, but I wish he had been more scientific about obtaining the results. He did debunk some myths, especially the one common at the time that the Japanese Arisakaicon was total junk, made of cheap tin or scrap iron, and that the 98 Mauser was a superstrong product of Germanicon engineering and would never fail. Both views were nonsense, and Ackley proved it.

Jim