So are you talking about your "hot Weatherby's" shooting factory loads, or your Weatherby handloads?

None of the Weatherby rounds have a SAAMI Maximum Average Pressure of more than 65,000 PSI--which is the same as the .270 Winchester, .280 Ackley Improved, and a bunch of other cartridges.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck