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Old November 8, 2012, 03:02 PM   #1
west5757
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.223 bullet weight for 1:7 Twist Sig 556

I have a Sig 556 with a 1:7 twist. When I sighted it in I was all over the place with 55 grains. I got a box of 64 grainers and it made a lot of difference.

I was wondering if anyone has found the optimal weight for this gun?
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Old November 8, 2012, 03:09 PM   #2
RickB
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The 1:7 twist was adopted along with the then-new 62gr G.I. load, so I would expect it to be optimal for bullets of that weight.
I have a 1:7 AR, and can consistently break clay birds at 200 yards with 55gr ammo, which must be better than "all over the place" accuracy?
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Old November 8, 2012, 03:15 PM   #3
pturner67
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West5757, what distance are you shooting?

My 1:7 does great with anything 55-77 grain but it's rare I go past 100 yds.
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Old November 8, 2012, 03:19 PM   #4
Crow Hunter
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Are you comparing 55gr XM193 or Wolf ammo to premium 64gr hunting ammo?

If so, that really isn't a good comparison.
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Good luck.
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Old November 8, 2012, 03:31 PM   #5
west5757
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Rick B... I could hit clays at 80-100 yards when I sighted it in with 55 grain...maybe. It would be close.

pturner... I shoot mainly 100 yds or less.

Crow Hunter... I was shooting cheaper ammo. That does make a difference.

When I sighted it in I thought maybe my scope was off or something. I was frustrated. The next day I got heavier grain bullets and the difference was amazing. I'm getting some 64 grain soft tips today (that's all that is available locally) and trying that out.
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Old November 8, 2012, 04:36 PM   #6
Metal god
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I have an AR with 16" 1-7 , free floated barrel with a red-dot . It shoots well at 50 yards about 4MOA = 2" groups at 50yds. I wanted to find out how accurate the gun really was so I put a scope on it and tested it out . I shot PMC , x193 , Privi , some kind of winchester all 55gr and I had some 77gr federal gold metal match . All the 55gr stuff was around 3MOA @ 100yds ( thats with a 3-9x40 scope )but the heavier match stuff I could shoot just about 1 MOA with .

IMO if you want to find out how accurate your gun really can be you will need to get some good ammo . 55gr and up should be fine for your rifle but the heavier you go the better it should be .

There is one other thing . If you have a stock mil-spec trigger you are going to have to really concentrate on your trigger pull . they do not lend them selfs to accurate shooting .
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Old November 8, 2012, 04:40 PM   #7
Sweet Shooter
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Someone here told me "Sometimes things that are not supposed to work often do". I have a SIG 400... 1x7 It shoots 40gr V-Max like this:
-SS-

Last edited by Sweet Shooter; December 18, 2014 at 06:09 PM.
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Old November 8, 2012, 05:04 PM   #8
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Sweet shooter thats a sweet group
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