Just got my hands on a Peterson 7 PRC case. I used fine ball powder to compare the Weatherby 338RPM v 7PRC case volume. The RPM case capacity is slightly greater than the 7PRC!

I suspect the velocity capability of the Weatherby 338RPM v 338Win will be close to identical.

Also the Weatherby 6.5RPM capacity far exceeds the 6.5PRC which is closer to the 6.5-06

Last edited by RinB; 08/09/23.

“Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away”.
Antoine de Saint-Exupery. Posted by Brad.