I had a 300 Blackout made on an M-4 style gun. Never ever checked into the cost of the ammo. WOW! What a shock when I went to local "department" stores for ammo. I found the Hornady 125 gr HP. Over 2 bucks a round. Bought some and it shot GREAT!!! And I mean GREAT. But at that price, I didnt shoot that much. When it came available on Guidefitter, I jumped on it. Great deal for great ammo.