There, their, they're. All different meanings.
No magnums of any kind in my house. Magnum are the most successful marketing scam in history. There is no game animal in North America that requires a magnum to kill.
There are times when a flat trajectory is beneficial, and a slippery 180 at 3000 fps, is then preferable to a 150 at 3000 fps. There are other times when big power might not be necessary, but is certainly comforting. For a hunter who travels the world in search of trophies, next to a .375, a .300 is almost a prerequisite, and in a fine rifle, with good ammunition is just enough more than the '06 to get the nod. That is, it would get the nod if you're willing to carry a rifle that's just a little longer and a bit heavier. I've been a fan of the .300s (Weatherby, H&H, and Winchester) since my teens, have shot more than a few of them, but when it came time to lay down my money, I always went in another direction, and to me the darlings of the .30s is an '06. Interestingly, a true magnum cartridge, but was never advertised as a magnum, is the .416 Rigby.
I'm not anti, magnum, by any means. But my first magnum rifle, was a magnum in name only, a .350 Remington, when what I wanted was a .340 Weatherby. But the $300 for a new Mk-V or a Japanese Golden Eagle in .338 was so far out of reach in those days, they might as well have cost a million, as was any custom rifle, the only other way to acquire a .340. While Remington had plans for a new 8mm magnum, they didn't chamber the .338 in the M-700. The folks who I looked up to as knowledgeable in those days, were still stinging from the changes made to the M-70 and warned me off Winchester, so there would be no M-70 until much, much later in life. I could have chosen a Ruger, but a pal who owned one in .270 was bragging up a 6" group he shot with his at 200, and I was underwhelmed with the performance. Certainly I had heard of the .358 Norma, but had never laid eyes on one. Hence the .350, which was claimed to be a ballistic twin of the highly touted .35 Whelen, but wasn't quite.