...It appears as though I strike out on both counts. I'm not a fan of the .300WM, and I dislike Barnes bullets.
And, yes, I've used both. I had a Belgium Browning Safari Grade .300WM. Beautiful rifle, and accurate. I killed mule deer, elk and black bear using this rifle. Why am I not a fan? I'm not a "scout sniper" and don't shoot beyond 300yds. Mostly, about half that distance. I can accomplish killing plains game with either a .30-06 or a .308 using 180gr Nosler Partitions, or Swift A-Frames. Whatever advantage the .300WM may have, read velocity, I have no need.
I've used Barnes Bullets on two occasions. first: I killed a Zambian lion with my .416 Taylor using old style Barnes 400gr SP bullet. Second: I was the camp manager and received a call from the Gokwe council they were needing three zebra for a weekend "party." I didn't want to use my .458WM on zebra, so I took the camp m-70 .375H&H and picked up some client left-over ammo which happened to be Barnes.
I drove to Johanna Block and shot three Zebra using the aforementioned equipment. Did the Barnes bullets fail? Of course not. Accurate shooting any of today's bullets would have achieved the same success.
My dislike for Barnes. (Actually has nothing to do with their bullets, per se.)
I was working the booth for a Zimbabwe safari operator at the SCI convention in Reno. Before the doors opened to the public, the operator asked me to check with the Barnes booth for .470 bullets. I located the Barnes setup, and there was one individual behind the tables. I waited until this individual seemed not busy, and I asked about the bullets. My greeting, and question was ignored, and I thought perhaps I wasn't heard. I posed the question again, a bit louder. And without as so much as a "Good morning, how are you?" The response was "What you see is what you get." And turned around and walked off. That my friends, was none other than Coni Brooks of Barnes Bullets. IMO, what a bitch.
If I were to up caliber, I would probably go with the 9.3x62. A bit much for plains game, and a bit meager for dangerous game. But just enough either way.