Left to Right: .300 H&H Magnum, .30 Newton, .300 Weatherby Magnum, .308 Norma Magnum, .300 Winchester Magnum, .300 WSM, .300 Remington SAUM, .300 Remington Ultra Mag, .30-378 Weatherby Magnum
When I was in the self imposed great debate of which 30 caliber rifle to add to my hunting arsenal. I looked at all of these above plus the 30-06. Read many books & articles and talked to as many folks that I could. I'd already owned a 300WM & 06 in my past. And for sure was pleased with their performance in the field. And frankly after all of this information here on this thread coupled with everything I've heard from others and read. All of the 30 magnums are about the same in the field. Deer to elk don't know the head stamp of the cartridge that fires a 150 to 200gr bullets. They all seem to be die with a properly placed bullet.
I'd read where rag writers said the efficiency of the short fat new magnums were better than the others. But when it all came to my final choice of which 30 magnum I wanted for a hunting rifle in, it really boiled to history and likes.
I like my women tall and shapely, I'm not attracted to short and fat or women that have broader shoulders than I. I do like women that can wear a belt low on their hips. Not a big fan of short necks, I think, long slender necks are sexy.
Then we have history. The maturest of all listed, that wears a belt. She's known for her elegant accuracy, high efficiency, buttery smooth swagger to the chamber, and she doesn't kick you out of bed.
The other thing that I felt more important was the fact that I've been shooting a 375H&H Magnum exclusively for over a decade. Having a bolt throw similar made for common sense.
My choice was the one pictured far left, 300H&H Magnum. It'll do everything the WSM & WM and has been doing so for a very long time. The debate of which is better, will probably go on forever with different likes, thoughts and beliefs. As noted above there isn't a dimes worth of difference among them all.