The allure is barrel life and low recoil with 223, 223AI, 224V, 22 Grendel and 22 BR.
My 223AI is at 2813 fps with 88's (24.8gr Varget), in the low node, in a 28" 7 twist, at 2.614" OACL. I expect 5000 rounds barrel life which would be awesome. I just wish there were mags that would provide that length!!! As an example I cleaned our course on our smaller steel for the first time with this combo out to 981Y, so it does better than I thought it would in light winds. If you think about it the ballistics are close to the same as a 6.5 Creed with 130's. I was perfectly happy with those bullets, at that speed.
I'm guessing the next node up would be near to 2900 fps and might be able to reach that velocity with 26 grains of powder.
Point being getting the appropriate work done with as little powder as possible. Of course this is speculation but I can see a 224V, like I described in my earlier post, getting very good barrel life in a longer barrel??!!