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Expert Answer
The Federal Premium V-SHOK .223 Remington 55 grain Nosler Ballistic Tip Brass Centerfire Rifle Ammunition will work well in a .223/5.56 AR15 with a 1:9 twist. The 1:9 twist rate is best when using lighter grain bullets medium grain bullets. However, each rifle has its preferences in terms of what ammo shoots the best through that particular gun. But this Federal Premium V-SHOK .223 Remington 55 grain Nosler Ballistic Tip Brass Centerfire Rifle Ammunition should shoot fine in your rifle.