I have had a 300 Winchester for over 25 years and have shot 20 rounds through it, at the range. I have other 300’s but, really have had no interest in using them. Though I do think the 300 magnums are multi-purpose and longer range rounds.
Personally, I would prefer the 325 WSM on shots 300 yds and under. Those distances, I don’t think the ballistic advantages of the 300 magnum is a notable advantage.
I am not sure one or the other kills any better than the other at those distances. Perhaps, I just like the 8mm better than the .308 caliber. The .323 splits the difference between the .308 and .338.
I have Kimber Montana in 325 WSM that shoots the 200 grain TSX quite well. It is a lighter rifle presently with a 1.7-10x42 scope. I think this combination covers a lot of game animals under 300 yds.
It plays 4th string, after my 416, 375, and 338.
200 meters is about the farthest distances that I will be shooting. So, trajectory and wind drift plays little in my choice of cartridge or rifle.
Mule deer and Colorado elk seasons almost done! Hunters driving farm roads, looking for racks, their PH driving them along, I ask that you not pull into my drive. The buck behind me, on the boundary line of the GMU somehow knows. The hunter laughs, I would invite you in to see my Searcy rifles but social distancing prevails, darkness arrives and the buck slides away into secret tree grove...