223 or 556 Ammo for AR SR556?

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kitjv

Bearcat
Joined
Dec 4, 2021
Messages
4
I recently acquired a SR 556 & am familiarizing myself with the gun. My apologies if I am asking an all-too-frequent question. I understand that the gun will fire both 223 & 556 NATO rounds for which there are some differences in powder & case dimensions. Does Ruger recommend one round over the other? Thank you so much.
 
Joined
Dec 25, 2007
Messages
9,933
Location
missouri
I'd suggest you not let yourself get all wound up in the .223 vs 5.56 kerfuffle. When looking at domestic production, the line between the two is blurry and indistinct.
 

45acpskng

Bearcat
Joined
Dec 3, 2021
Messages
15
My 584 Series Mini14 prefers 223 over 5.56, and gun is stamped 5.56 Nato. You have to try each, you're gun will tell you better than anyone on here.
 

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