Wolf Polyformance 145 gr FMJ Steel Cased 300 Blackout Ammunition, 20 Rounds – WOLA300AACFMJ

Group approximately one and one quarter MOA at 100 yards out of a 16 inch barrel perfect for plinking

So steel cased ammo fouls your rifle more than brass and you can't reload it. It's as accurate as brass for me, but after 30 rounds I'm having to charge the weapon before every shot. Annoying...but it's cheaper.