5.56 Rate of Twist - The HuntingPA.com Outdoor Community
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post #1 of 25 (permalink) Old 05-01-2017, 09:06 PM Thread Starter
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5.56 Rate of Twist

I went to the range today and fired my Springfield Armory Saint and found that I could not even keep the rounds on a piece of paper that was 4 feet square. The rifle has a 1 in 8 ROT and I was shooting 55 grain Federal ammo. Should I be shooting a heavier bullet?

Good night Chesty, wherever you are......
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post #2 of 25 (permalink) Old 05-01-2017, 09:29 PM
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Its not the twist. Something else is wrong.

I shoot 55's in a 1 in 7 twist and they shoot good.
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post #3 of 25 (permalink) Old 05-02-2017, 07:25 AM Thread Starter
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Its not the twist. Something else is wrong.

I shoot 55's in a 1 in 7 twist and they shoot good.
Yikes!

Good night Chesty, wherever you are......
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post #4 of 25 (permalink) Old 05-02-2017, 04:07 PM
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Yikes!

I could not even guess at a problem that could cause that kind of inaccuracy.
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post #5 of 25 (permalink) Old 05-02-2017, 04:40 PM
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How far was the target? What type of optic/sights? I experienced similar accuracy with my 270 deer rifle last year. After the day at the range I went home and starting cleaning it and found the scope mounts loosened slightly.
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post #6 of 25 (permalink) Old 05-02-2017, 05:14 PM
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i have a DPMS M-4 with a 16 inch barrel 1 in 9 twist and it handles 55 to 64 grain very well

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post #7 of 25 (permalink) Old 05-02-2017, 05:15 PM
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55gr should shoot in just about any twist you would find. I'd look for other issues.
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post #8 of 25 (permalink) Old 05-02-2017, 05:28 PM
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Jimsdad

Describe your set up.

Like Mad said I would start with the sighting system. Do you have a scope or are you using open sights? The Saint is a flattop right?

Are you off the paper because the groups are so big or because you never got it on paper? I'd start at 25 yards or closer if needed. The AR can also be easily bore sighted by removing the bolt and aligning the scope and bolt. Once you get on paper we can talk about group size and ammo.
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post #9 of 25 (permalink) Old 05-02-2017, 09:24 PM Thread Starter
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Jimsdad

Describe your set up.

Like Mad said I would start with the sighting system. Do you have a scope or are you using open sights? The Saint is a flattop right?

Are you off the paper because the groups are so big or because you never got it on paper? I'd start at 25 yards or closer if needed. The AR can also be easily bore sighted by removing the bolt and aligning the scope and bolt. Once you get on paper we can talk about group size and ammo.
Going to go back to the range tomorrow with American Eagle ammo in 55 gr and also 62 grain starting at a shorter yardage. (the ammo I used with such rotten results is Federal 55 gr FMJ boat tails).

I am using the off the shelf Springfield Armory peep sights - smallest aperture. FWIW, I am a peep sight wizard; no brag- just fact.

The "group" is all over the map and out of 30 rounds, only 18 hit a 4 square foot cardboard at 100 yards.

None of the holes showed signs of keyholeing.

I was shooting from a bench and the rifle was fully supported.

The rifle is brand spanking new and before firing I cleaned it from butt plate to flash suppressor paying particular attention to the bore, chamber and entire bolt and receiver.

Shucks, I mean shoot...

Good night Chesty, wherever you are......
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post #10 of 25 (permalink) Old 05-02-2017, 09:41 PM
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Certainly new rifles have some what of a break in period but this seems too extreme. I would be checking to ensure sights and pins and everything are not loose.
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