There are probably slightly better quality bullets available for handloading in 7mm than .270. And a wider variety to choose from.
These are excellent cartridges, much more logical in design than the older belted-type magnums. But it seems to me the manufacturers are not doing their customers any favors by turning out so many near-identical variations. All these new rounds cannot survive in the market, and some folks will end up with orphaned rifles 10 years from now. Just looking at Winchester, how much practical difference can there really be between a .277" diameter .270 bullet and a .284" diameter 7mm bullet? Even worse, is there any difference at all in performance between the .300 WSM and the Remington .300 Short Action Ultra Magnum? It sounds to me like Winchester was first up with this idea; Remington should have just chambered for the competition's round like gun manufacturers have always done before, or at least come out with a .338 variant or something instead.