Well said, Gringo. I've also surmised the only way to really contrast cartridges is to look at the bullet weights that each can send at similar velocities.
My choice is to compare loads I actually use, as I did here:
https://www.24hourcampfire.com/ubbt...141380/re-300-magnum-vs-338#Post12141380The primary difference between the two rifles (.338WM and .300WM) is the .338 has a Limbsaver recoil pad while the .300WM has the Ruger tire tread pad. THe .338WM still hits much harder than the .300WM.