So today, I'm playing around with my AR-15 and noticed in very small print on the barrel, under the keymod shroud, it reads: "5.56 x 45 NATO 1/7."
I knew it was a 1:7 twist (but don't remember how I knew this); but did not know the upper was chambered for 5.56 NATO.
So far, all my load workups are with 223 Remington data. Am I doing it wrong?
Background: I had my AR built by a knowledgeable friend back in '17. I told him I want a nice one and don't mind paying a few more $'s. He told me what parts (I already had the blank lowers) to order online and I did so. I took all the stuff to his house and he built it out. This was over 5 years ago and my memory of the whole thing is vague. And so is his: A couple months ago, I asked him about it and he had forgotten entirely that he built out my AR. (I know we never discussed twist rate - being completely new to rifles back then, I didn't even know twist rate was a thing.)
That was California in 2017. Now that I live in a free state, I have finally gotten around to doing load work ups.
I knew it was a 1:7 twist (but don't remember how I knew this); but did not know the upper was chambered for 5.56 NATO.
So far, all my load workups are with 223 Remington data. Am I doing it wrong?
Background: I had my AR built by a knowledgeable friend back in '17. I told him I want a nice one and don't mind paying a few more $'s. He told me what parts (I already had the blank lowers) to order online and I did so. I took all the stuff to his house and he built it out. This was over 5 years ago and my memory of the whole thing is vague. And so is his: A couple months ago, I asked him about it and he had forgotten entirely that he built out my AR. (I know we never discussed twist rate - being completely new to rifles back then, I didn't even know twist rate was a thing.)
That was California in 2017. Now that I live in a free state, I have finally gotten around to doing load work ups.