First: it’s a short range improvement on 223/300/450, when bullets, energy, blast, and recoil are factored in. However, if it had been done (IMO) ‘right’, with a 223 case and 357/358 bore, at 5.56 pressures, it would be 200-400fps faster across the board....from a 16” barrel, and mud hole the competition to 300 yards, along with having easy components for loaders and more bullets for hunting. It’d look better than factory 35 Remington with pointed bullets, and hold up for range better than the hard kicking 45s. It’s still a good performing round vs the others. It just failed to reach the potential of the 357 AR.