I have shot the 300RUM a fair bit and IMHO my 338wm feels less, not in thrust or push but rather in sharpness of recoil. The 300wm is certainly less then both of these.
The RUM as a factory ammo shooter is wasted abilities, JMO but like other wildcats benefits greatly from reloading. The 300wm is better suited for an OTC ammo shooter. If you want more power then the 300wm, add the 338wm to the consideration list.
Good Luck