Well, all and all, I think it is an amazing round. As far as SAAMI pressure, the final specification of this may be what is holding up mass production of this round or rifles by Remington.
A small CZ rifle in this caliber, with the detachable mag, would be fantastic. Much more versatile than the 7.62 or the .223. However, despite some rumors, I have not seen any firm announcement by CZ that they are definitely releasing a rifle in this caliber. If someone has a link to such an announcement, I would appreciate the information, because I would probably buy one.
Only other point, I think that these great ballistics being printed up by Remington are based on a 22 inch or maybe even a 24 inch barrel. If you end up with a Rem Model 7 type rifle, with only a 20 inch barrel, that loss of an extra 100 to 200 fps could be much more critical for this round than for other rounds, because this one appears to be perched just on the "edge" of the 2700 fps mark.
I think that Remington is letting Barrett "carry the water" with respect to all gun manufacturing and tooling risks on this one, and that Remington plans to just sit back and crank out special batches of the ammo from time to time. If the round really takes hold, we may then see Remington make some rifles. If it doesn't, then we may have another "Whisper" scenario on our hands.
Big Paulie