5.56 1/7 twist rate

They absolutely can and will.

With that said there are always exceptions to the rule, sometimes a barrel just won't shoot well but generally its not an issue.

I've taken my Colt 6920 out to 300 accurately.
 
1/7 Twist 55 grain, yes, but TMD is right what do you mean by accurate??

1.0 MOA or 0.50 MOA or less??

Your 1/7 twist will handle much heavier bullets, so you are not getting the full potential out of your rifle with just 55 grain bullets, I would recommend going to a 60 or 62 grain bullet.

Just my 2 cents.
Stay safe.
Jim
 
Can a 16" AR-15 with a 1/7 twist rate shoot 55 grain bullets accurately? These will be my reloads.
Click to expand...

Can? Yes.

Will? Remains to be seen.

With a 1:7 twist you will probably get better accuracy with a 68 to 77 grain match bullet. Hornady 68s and 75s are pretty cheap if you buy them in bulk.

Jimro
 
It will depend on the quality of the bullets. Cheaply made bulk bulk bullets may suffer from imprecise jacket wall thickness, and that can result in bullets that wobble in flight (spin eccentrically) and drift off their intended trajectory. The faster you spin such bullets, the faster they drift away from the point of aim. But, as mentioned, Hornady makes bullets that are pretty good for less money than most of the makers do, and using their bullets and avoiding pull-downs and cheapies will go a long way toward avoiding the eccentric spin issue.
 
Not to pile on here but yes a 1-7 can shoot a 55gr bullet accurately . As some of the more knowledgeable here have stated . The better the bullet the more accurate it can be but doesn't that go with out saying ;)

I have a load that shoots right at 1moa or 1" @ 100yards . It's 25.5gr IMR 4895 and Hornady 55gr FMJ-BT . That's from a Del-ton 16" chrome lined heavy barrel . So it not only can be done . It does not have to be a Krieger barrel either .
 
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Thanks!

I want to build another AR with open sights for two local military shoots. One shoot is open sights only at about 60 yards on paper. this one is a little tricky because if you go off target you loose points. The other shoot is steel targets from 50yds to 200yds timed. I got a lot of 55gr bullets on hand that's why I ask the question.
 
I built a 20" WOA match service rifle that is 1-7" and I shoot Hornady 55 gr bulk fmj's for my training ammo. They shoot good. Keep in mind the 55's are not the best choice , (69's and even better is 77's are the best ) but shooting match bullets gets expensive so it's nice to be able to practice with the cheap 55's.
 
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