.223 Ammo Grains


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Old 09-15-2013, 02:43 PM   #1
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Default .223 Ammo Grains

I have a STAg AR15 with a 1/8 twist and TC Venture with a 1/12 twist. All of them are in .223 but I needed help to know what is the best grain if ammo I should be shooting ? I need your help these are new rifles never shot before and I don't want to destroy them... Thanks



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Old 09-15-2013, 03:23 PM   #2
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One for both? I'd guess that 55 gr ammo would be your best starting point. The Stag will shoot the heavier stuff better. The TC will likely not care for bullets much heavier than 55 gr.
As far as destruction related problems, nothing much to worry about, just don't use 5.56 ammo in anything exclusively built for .223 only. Beyond that, if you pick a bullet weight your rifle doesn't like, you'll simply get degraded accuracy.

This covers the bullet weight thing in detail: http://www.firearmstalk.com/forums/f20/understanding-barrel-twist-bullet-weights-44557/



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Old 09-16-2013, 04:11 AM   #3
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Like overkill said the 1-12 twist will be effective with 55 gr and below and the 1-8 will handle 60 gr and above

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Old 09-16-2013, 06:25 AM   #4
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Just don't go below 55 grains in the 1-8 and stay away from any milspec or .556 ammo and you'll be fine.

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Old 09-16-2013, 06:49 PM   #5
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For the 1:8 twist Stag, 69 grain Federal Gold Metal Match.
For the 1:12 twist TC, Any Premium Ammunition in the 55-60 grain range.
If you hand load I have had great success with 52 grain Sierra Match Kings with 26.2 grains of W748 in both the 1:8 and 1:12 AR's I own.

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Old 09-16-2013, 06:55 PM   #6
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I had a bravo company 1:7 twist and I've been shooting mostly 55 grain because its what's available to me..

I should be shooting 62-75 grain correct?

And if I stick with the 55 grain what will the downsides be?
Decreased accuracy? Too high? Too low? All over the place? It's pretty dead on up to 100 yards to far.
...guessing it won't make too much of a difference until >100 upwards?

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Old 09-16-2013, 07:07 PM   #7
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The Stag should have a 5.56 chamber.

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Old 09-16-2013, 07:27 PM   #8
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Quote:
Originally Posted by icallshotgun88
I had a bravo company 1:7 twist and I've been shooting mostly 55 grain because its what's available to me..

I should be shooting 62-75 grain correct?

And if I stick with the 55 grain what will the downsides be?
Decreased accuracy? Too high? Too low? All over the place? It's pretty dead on up to 100 yards to far.
...guessing it won't make too much of a difference until >100 upwards?
Below 55 in a 1:7 and you'll overspin the bullet. Accuracy decreases and fire the wrong ammo and it can come apart. 1:7 can handle just about as large of a grain .556 bullet as you can find. 55 should work just fine for you out to 150 yards or so. I wouldn't try anything smaller though.
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Old 09-17-2013, 02:09 PM   #9
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Default 223/556 Ammo

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Originally Posted by DeltaF View Post
Below 55 in a 1:7 and you'll overspin the bullet. Accuracy decreases and fire the wrong ammo and it can come apart. 1:7 can handle just about as large of a grain .556 bullet as you can find. 55 should work just fine for you out to 150 yards or so. I wouldn't try anything smaller though.
While I generally agrre with the statement you should not go lower than a 55 grain projo. The 52 grain SMK is a lot longer projo than the 55 grain projo and it doesn't get over spun in any of my 1:7 AR's and accuracy has been excellent in all my AR's from 1:7 twist thru 1:12 twist.
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Old 09-17-2013, 02:29 PM   #10
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The 1:12 twist will not effectively stabilize rounds above 62 grains. The 1:8 55-69 very well. But I would recommend staying with the 55 grain bullet since you have two different twist rates. I have a Rock River A-4 Varmint in 1:8 twist and on a good day with P223E Federal Ammunition in 55 gr. will group 1/4 inch groups on occasion. Doesn't get any better than that. So you can very effectively use the 55 gr. round in both. But a 69 grain round will keyhole on the target shot from a 1:12 twist.

Velocity X *12=__________ Divided by the Twist Rate (12) (9) (8) or (7) =____________X *60 = RPM of the bullet leaving the bore! Equals RPM. (Choose Your Twist)
We know most all 223/5.56 Ammunition velocity is more than 3000 FPS but we will use that velocity in the below examples.
This gives you an idea of the Revolutions Per Minute it takes to stabilize a in flight.
For example if the velocity was 3000 FPS the 1:12 Twist would equal 180,000 RPM while the 1:8 would equal 270,000 RPM. Using the formula above. A general rule is the heavier the grain bullet the faster the twist rate must be to stabilize the round in flight. The numbers with an * above are consonants in the formula always representing *Inches (12) and *Minutes (60).
This does not mean that a 55 will not shoot good in a 1:7 but only that peak accuracy will normally be with heavier grain bullets.
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