If you look at the cartridges Newton designed, one could argue that he DID have a horn to blow. Look at the specifics of the 30 and 35 Newton, Dan. You'll find that, with today's powders, they are quite possibly the best cartridges available in either caliber. They are rimless, beltless magnum cases that are without flaw in their design. He applied modern case geometry of minimal taper and sharper shoulders, while eliminating the minor challenges associated with belted cases.I didn't say Donaldson invented 250-3000. I said he suggested a 30-06 sized rim to solve the problem SAVAGE was having with it. I said Mr. Pierce [ the ballistic engineer] at Savage invented it.
Newton was a shameless self-promoter and never missed an opportunity to pat himself on the back and blow his own horn. Even when he didn't have a horn to blow.
With hindsight being 20/20, he was decades ahead of his time, in terms of rifle cartridges. If his estate was not so obtuse in maintaining their proprietary nature, a great many more hunters and shooters would have rifles chambered in Newton cartridges. All I can surmise is that you haven't studied his work.