What does that actually mean, though?
What I was told by the cylinder manufacturers was that any published CAS data (at that time anyway) was around the 12000 psi rating or less regardless of bullet weight or velocity shown. That was in the 45 colt and I never asked any questions regarding other calibers. What I was told by the gunmakers was the use of the cylinders in their firearms was totally unacceptable for use with any smokeless powder! and they refused to tell me the type of steel used in the guns, but rather said the steel was only rated for blackpowder pressures. If you ever do any modifications to those guns it will quickly become apparent to you how soft the steel is compared to a modern revolver.