I am not 378, but if you missed my question, the answers may give you some information....
http://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/3378526/1


"I don't blindly load until they match factory ammo, chronographed, velocities. I do cherry pick load data to get where I want to be. I understand the Weatherby ammo is loaded to higher pressures, in relation to the majority of other factory rounds, as it obvious that it must be so."

Weatherby cartridges have larger case capacity than most other competing rounds, and the case capacity CAN allow them to get more velocity without having to increase the pressure.... but, we all know they ( wby ammo) is loaded to the gills in pressure, and assuming ( big ?) it is loaded TO SAAMI max, it inherently has no safety issues, hence my earlier thread.... Asking if anyone feels they exceed SAAMI, or can a handloader match Wby ammo's measured velocity.

Allen