To be brutally honest, not what yall want to hear, just about any critter likely to be hunted/shot by any of those cartridges wouldn't be able to tell ANY difference which they was shot with! Also if the shooter is enough of a marksman & has trajectory either memorized or a cheat sheet taped to the stock will be able to shoot/hit with any of them anyway. So it's kind of a moot point. Gunwriters don't like to hear this because they make their living splitting hairs & writing about it. The whole 300 WM vs 300 WSM war is kind of silly as there's not enough difference ballistically to matter when handloaded. The longer 300 WM does have an advantage with very long bullets. It's a simple matter of physics and cannot be changed that when you take a smaller case (capacity) and reduce it's volume even more by seating an extremely long high BC bullet into what was powder space, there's no way it can have higher velocity with the same bullet & loading pressure. Having said that, it don't matter which you choose as long as you invest the time/cost of getting to intimately know your rifle/bullet/cartridge/scope combo. The 1,000 yard matches have very little to do with this discussion involving & OP asking about a hunting rifle/cartridge. It's like comparing a tennis racket roa golf club and saying 1 is better than the other/s!