I built a SPR specifically for this round. 20" fluted Wilson SS 1 in 8" R twist upper. Billet lower, Gieselle SSA trigger in a billet lower, with Magpul PRS stock, topped with a Bushnell 3.5-21x50 TRMOR scope. 3 expanded single hole groups after zeroing at 100. 5 three shot groups at 300, nominal wind, resulting in smallest group at 1-1/2". This was shooting off a tipped over cable reel with the rifle resting on its Harris bipod in front and my fist beneath the stock. In other words, not a super stable setup. This ammo makes the 223 platform completely useful, in my opinion, out to 500 for sure and 600 if you'd like. A GREAT upgrade to the 223 caliber family and a superb improvement over the more conventional 55 and 62 grain bullets widely in use.