Yup, because the 300H&H, 308 Norma, 300 Winchester, 300 Weatherby, 30-338, the three 300 shot magnums (Remington, Winchester, Ruger) the Lazaroni offering, the 300 Rem Ultra mag and the 30-378 are simply not enough. We just have to have one from Nosler......................don't we?

I own a 300 H&H, and also rifles in 308 (7.62 NATO) and 30-06.
In those 3 cartridges I have a lot of over-lap, meaning that the mission statement of each rifle is ballistically covered pretty well by the others. Deer, antelope, elk, moose, bears, as well as making hits if needed out to 1000 on paper. The 300 does the long range game better then the 308, but both can be made to work. The 308 is more economical to fire than the 300, and the 30-06 fits well between the other 2.

Every time I hear about some new 300 "Stupendous Magnum" I have to yawn.

I like to shoot and I shoot a lot. I see no reason that makes me want to re-barrel my rifles more often. My 300 H&H gets only a few rounds a year. Maybe 150-200
My 308s get a LOT more, maybe 1500 each, and my 30-06s get about 600 a year each. This is just my 30 caliber shooting. There is much more shooting done from other bore sizes, so economy of ammunition is important to me.

Of the three 30 calibers mentioned above that I shoot they all do all I ask of them every time I ask it of them.

I am a full time gunsmith and I have shot quite a few of the newer bigger magnums setting them up for customers. I have to say I am unimpressed by the amount of speed I can get from them when I compare it to what that speed comes out costing in the end. To me it's simply not worth the extra powder and barrel life.