5.56x45 m855 from a 1-8 twist barrel - Winchester USA 5.56x45mm NATO 62 grain Green Tip M855 Full Metal Jacket Boat Tail FMJBT Brass Centerfire Rifle Ammunition

It’s the only non match 5.56 ammo my rifle shoots that gets me 2 inch groups (sometimes outside of that) to me that’s highly acceptable for the price point