As to the intro on a bigger 300bo, seems interesting as I like efficient cartridges. Now as to whether it is more useful than other similar cartridges , well...
Seems all these new things are designed around the AR platform. Personally they hold no interest, the AR 10 is way too heavy for me to be interested. I always liked the idea of 338federal and had it been available my Kimber would have been so chambered.
Most of these new things are just a rehash of something from the past, updated. The 6.5 is a 250 Savage with a fast twist and very high pressure rating. I know its slightly bigger bore. The whole thing was to use the high BC bullets and get the thing to fit in the AR platform.
Im all for efficient cartridges, but whether it fits in an AR is of no concern to me. The new cartridge is less useful, real world than the 338federal, and I hardly ever see one of those. Good round but no sales, maybe the AR crowd can keep it afloat, who knows. What I would really like to see would have a rim and 100% case capacity with 4895 to drive 220 gr cast to 2000fps
Long neck like the 3030 too, yeah its out there, but not a factory offering. All about marketing!!