I'm kinda in the same boat....but I know some stuff. I probably shot at least 15 cow elk in as many years with my .270. The last two years two cow elk with my 6.5CM. I finally put in for bull elk last year and was tag soup. But I felt nervous the whole season with my CM. Inside of 400 no problem I felt but outside of 400 left me wanting.
I'm on the fence with 300WM or 300PRC.
Luckily...luckily...my buddy has both and loves to let me shoot them....I'm digging the PRC.
Now here's my .02 cents...double up on hearing protection. I'm talking muff's and plugs. Do both, your ear's will thank you. Loud will make it lots worse than it really is.
Do you re-load? That's another factor really, especially with the no-ammo these day's. The last to go on our shelves for factory ammo here was 300WM. And its been sold out for months now. So there's that.
But above all else you need to go shoot some 300's with big time hearing protection to really decide. I'd shoot off-hand into the brush the first shot to see how sissy it is first. Then off a bench. I'm serious. I'm 5'9 and 140lbs recoil is a factor for me. -WW