I do not have any experience with that specific cartridge but I did read an article about it and I did stay at a Holiday-In Express recently. The cartridge is geared towards across the course high power shooters. I guess the selling point is that it has better performance at 600 yards and less recoil than the 6.5 Grendel using the 90gr HPBTM projectiles. You can load those in a .223/5.56 but you have to single load them into the chamber. With the Valkyrie they are of magazine length so you can shoot the same load across the course instead of using one load for the rapid fire stages and another for the slow fire.
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