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Author Topic: AUG Ammunition Recommendations  (Read 392 times)
wrathgar
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« on: April 30, 2017, 05:06:10 PM »

I've got a AUG A3M1 with a 20" USR barrel. I'm hoping to get ammunition recommendations from some of you guys with more experience than I. What would be the heaviest .223/5.56 round that I could use with this barrel without adversely affecting accuracy?

Thanks!
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Jerusalem
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« Reply #1 on: May 04, 2017, 07:20:14 PM »

No issues with 77gr OTM.

Used some black hills Sierra Match King (Mk262) the other day with a pretty acceptable 1.5" group at 100yds. Red dot.
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wrathgar
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« Reply #2 on: May 07, 2017, 02:51:52 AM »

I appreciate the information. I'll have to give those a try and report back.

No issues with 77gr OTM.

Used some black hills Sierra Match King (Mk262) the other day with a pretty acceptable 1.5" group at 100yds. Red dot.
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LazyEngineer
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« Reply #3 on: May 08, 2017, 10:14:58 AM »

Personally, I don't recommend 75 or 77 gr ammo.  Yes, it shoots tight - at close range.  But my AUG is right on the edge of stable when I tested it with 75 gr.  And those tight 75 gr bullet groups I was getting at 200 yards, completely fell apart on me at 500 yards, where it just lost it.  Heaviest bullet that any manufacturer recommends for a 1/9 twist barrel, is the 73 gr Berger. 

Which isn't cheap or easy to get.  My personal recommendation is to stick with 69 gr as the heaviest commonly available round for the AUG, and mine really sings with the Federal AE 50gr varmint polymer tip ammunition. 

It's made for 55 gr ball, and Wolf Gold will give you solid basic performance.

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Docduracoat
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« Reply #4 on: May 19, 2017, 09:19:23 AM »

Steyr says the 1 in 9 barrel will stabilize any weight bullet
Shooting expensive match ammo that costs $1.00 per round will shrink my groups by one half inch
I agree with Lazy Engineer that the best value for the cost is Wolf Gold 55 grain ammo
I am getting 2 inch, five shot groups off a rest with a 4x scope at 100 yards with wolf gold
I see it online for .28 cents a round plus shipping



* IMG_0308.JPG (3553.98 KB, 4032x3024 - viewed 9 times.)
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ezvalor
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« Reply #5 on: May 19, 2017, 09:45:35 PM »

The gyroscopic stability factor of the 77 gr SMK 1 inch bullet (MK262 Mod 1) at 60 degrees F, sea level, and at muzzle velocity of 2700 fps out of 1/9 twist is 1.335 according to the JBM ballistics online calculator.
The gyroscopic stability factor of the 55 gr 0.743 inch bullet (M193) at 60 degrees F, sea level, and at muzzle velocity of 3200 fps out of 1/12 twist is 1.332 according to the JBM ballistics online calculator.
So yes, the 1/9 twist will stabilize the longer 77 gr bullets just fine up to 300 yards or so. Problems start to be seen past that point in the lower velocity and trans-sonic range of velocities. The M16A1 with the 55gr M193 was a 300 yard gun. Can you accurately and predictably shoot up to 500 yards?! I say sure, but every shooter is different.
The same can be said with the Steyr AUG 1/9 twist barrel and 77 gr bullets. They're stabilized just fine, but I would not expect MK12 accuracy within or past 300 yards since that ammo was matted to that specific gun. The Steyr, even with the 1.5x power optic, will produce consistent hits with "man-sized" targets up to 300 yards with a wide range of ammo, but a sub-MOA gun it is not. However, it is plenty cool, short, fast on target, reliable, and a breeze to clean - i.e. a great service weapon.
FWIW - the 62 gr SS109 (M855) 0.9 inch bullet is a perfect match for the 1/9 twist barrel, even with its low density steel penetrator (translating to longer length per weight), at 1.5 stability factor.

Cheers!
« Last Edit: May 19, 2017, 09:49:17 PM by ezvalor » Logged
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