First off I don’t have a 300 wm , but I do hunt , shoot , and hand load for 308 and 300 wsm.
Next , are you fortunate enough to live where the elk roam , with elk hunting being just another everyday occurrence for you ? Or is an elk hunt a once or twice hunt of a lifetime for you , where you skimp and save for years then drive cross country. I’m in the later group.
What’s your maximum range you are willing to shoot ?
I like the 308 . It’s great for a lot of things. However when i went elk hunting I took the 300 wsm. Never even a question. Late season hunt shots average 200-300 yds , with 400-500 being very realistic where I hunt.
The 300 wsm adds approximately 400 FPS to the same bullet vs the 308. The 300wsm carries the same energy at 500 yds as the 308 does at 275 . No question to me !