Actually CCI 400's are "rated" (if you can call it that) to 50,000 PSI, the maximum average SAAMI pressure in the .17 Hornet and .222 Remington. (The .22 Hornet's MAP is 49,000 PSI.)
50,000 PSI is close to the equivalent of 45,000 CUP.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
