ORIGINAL: ELKampMaster
"....once per year for blackbear, mouse and elk..."
I don't know what rifles chambered for what cartridges thatyou already have....
All other factors equal, I would go with the 300 WSM hands down.
That said, I'm thinking a 22LR would be a much betterchoice for the mouse hunting.
LOL

I have a .300 wsm and I love the accuracy of the round and I would rather have the bigger round; especially for elk and mouse