"I am headed to Alaska in a couple days for some King Salmon Fishing on the Nushagak river..one of the best King Salmon fisheries in the world..but when I get back will fire up my 6.5PRC... curious how it will be compared to my 6.5CM... in terms of accuracy, recoil and distance ... "

here's a 6.5cm gun.
https://en.wikipedia.org/wiki/Cannone_da_65/17_modello_13

notice the projectile weight. guessing recoil would be unmanageable if shoulder fired!