What Bob said. I don't understand the Creed hype but I have two 6.5x55. The only "newer" rounds I've bought are the 338 Federal and the 6.8 SPC. I really like both rounds but the 338 Federal doesn't do anything a dozen other rounds won't do. The 6.8 SPC & the 6.5 Grendel seem to maximize performance out of an AR when it comes to bullet weight, velocity & ballistic coefficient. The Blackout is not a new round, it's the 300 Whisper marketed beautifully by Remington. They are interchangeable and the Whisper has been around for 20+ years.
