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Old 09-17-2012, 08:40 PM   #1
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Questions for those with AR-15's with 1/9 Twist Barrels.

Hello,

The sole purpose of this thread is to see just what an AR-15 with a 1/9 Twist Barrel will, or won't do, when it comes to firing 69 Grain or Heavier Bullets. So, let's keep this thread exclusively for AR-15's with 1/9 Twist Barrels, and let's only report data on firing 69 Gr. Bullets or Heavier that you've fired.

Now for the Questions:

What the heaviest bullets that you've fired through your 1/9 barrel(s), and did they stabilize them?

What brands of 69 Grain or heavier ammunition was used?

What's the furthest distance you fired the 69 Grain or heavy bullets from?

What the coldest temperature ranges that you've fired the heavy bullets (69 Gr. or Heavier) at - and were they stabilized (no key-holing, good groups, ect.) or did they key-hole at the lower temperatures and did the groups open-up, but shoot fine at higher temperatures?

What's the approximate elevation where you're at, or was when firing the heavy bullets?

What 69 grain or heavier weight bullet does your 1/9 Barrel shoot the best?

What brand is your 1/9 Twist Barrel?

And last but not least - after owning 1/9 Twist Barrel(s) were you completely satisfied with them, or would you now have rather bought an AR-15 that came standard with a 1/7 Twist Barrel?

Thanks for your replies,

Bob
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Old 09-17-2012, 10:15 PM   #2
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The only 1-9" twist AR I've shot very much was my last Highpower Match rifle, which was made on a Colt 6724. That's the "Accurized Rifle" with a 24" SS barrel, alum tube handguards, etc.

I usually shot Sierra 69 Match Kings, but did shoot some Hornady 75 match bullets. The Hornady 75 had a reputation of shooting OK in barrels it "should have" been too heavy for. It is on the short side for a bullet of that weight, and remember, it's the length that matters. The Sierra 77 was longer and wouldn't shoot in it. At the time, those two and some Bergers were all I knew of in that weight range.

It is very important to note that while my 6724 shot it fine, another one I know of did not. I imagine I was pushing it. Most people said it wouldn't shoot the 75s either.

I only used that bullet in the 600 yard slow fire prone stage of a couple of matches, and in some practice.
Usually I shot the 69 Sierra throughout. It was simply easier to use it, and I doubt if it made any difference in my scores. I was more familiar with the 69s wind drift, which offset any tiny gain of the 75. Fwiw, I was at my peak at this time, a Master and shooting High Master scores some then.
The main place for full course matches in central/southern IN is a military range, and the HP matches were actually shot at 500 max rather than 600. I thought the 69 was fine there unless the wind got really weird. Others said the 69 was too light at that range, but I think that was based more on a feeling than experience.

As far as temp goes, almost all of the matches would have been when it was no colder than 50 probably.
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Old 09-18-2012, 07:37 AM   #3
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Bob,

When I had my 1:9" twist Bushmaster it shot 69 grain Sierra Matck Kings magnificantly.
The 75 grain A-max was marginally stable.

My semi-auto's are al 1:7" twist rate now. They stabilize anything up to 80 grains.
They're a Colt 6920 and a Sig 551A1.

Hope that helps.

Wes
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Old 09-18-2012, 08:21 AM   #4
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Bob,

I have an older (1980's) Colts CAR-15 with a 16" tube. It has a 1:9 barrel and I have to assume it to be OEM. The only things on it I have changed have been the upper receiver and furniture.

I generally shoot only the 55 grain stuff because that is what I have and I have a CZ 527 with the 1:12 that would not shoot anything heavier. But, I have shot some of the 69 grain JHP Federal GM Match I got from a friend in the Colt and it worked well enough at 100 yards.

I generally limit my AR shooting to 200 yards/meters or less. I know it will go farther but I prefer 762 for distances above that.

The 1:7 twist would be the thing to have these days as the older M193 ammo is not as common or as cheap as it used to be. Even finding 55 grain bullets is not as easy as it was.
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Old 09-18-2012, 11:51 AM   #5
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Wes's comment about the 75 Amax being marginally stable reminds me:
I wanted to clarify that my 1:9 rifle shot the standard Hornady 75 bthp match fine. When I was testing this, the 75 Amax was either not out yet or still somewhat scarce. The earlier 75 bthp match was/is (do they still make it?) a shorter bullet than the Amax or 77 Sierra.
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Old 09-18-2012, 02:06 PM   #6
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I've shot Hornady's TAP 75 grain ammo out of my DPMS with a 20" barrel. The twist is 1:8, I know it is a bit of an oddball now, but when I bought the rifle it was considered the best twist for the caliber. The 75 grain rounds stabilized just fine out to 200 yards (the maximum distance that was available to me at the range). The temperature was in the 70-90 degree range, high humidity and near sea level. The group was almost as tight as that gun's favorite load (WWB 45 grain).

I don't know if the TAP rounds would be as accurate out of a 1:9 barrel, but I suspect they would.

Interestingly enough, that rifle will not shoot 68-69 grain bullets well. The groups open up to 4" at 100 yards.
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Old 09-18-2012, 07:00 PM   #7
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Wes - all my 5.56mm COLT'S as well as my Specialized Armament M4A1's have 1/7 Twist Barrels and obviously they fire all the heavy weight bullets just fine.

Actually, I haven't ever owned a 1/9 barrel before - but I wouldn't mind getting 4 or 5 COLT AR6721's just to use with 55 Grain Bullets, and they'd especially be handy weapons for when the time comes for laying down some high-rates of fire...

Any time someone comes in the shop looking for a "high quality" AR-15, I first ask them do you want a fighting rifle or do you want accuracy? If they say fightin' rifle, I then say Specialized Armament M4A1 or for a little less coin, you can get a high-quality COLT LE6920 >it's your call< - but if they say accuracy, then I say get a COLT AR6721 as long as you-plan-on-sticking-with 69 Grain Bullets or lighter because each barrel (regardless of twist rate) is a little different and it May or May NOT stabilize bullets over 69 grains.

Barry - check out this Custom COLT TR6724 by Specialized Armament - it started life as a CR6724.
Specialized Armament: TR6724 - Tactical Rifle

Nuclear - even thou the thread is exclusively reserved for 1/9 barrel data - your reply is appreciated as well as interesting! There's more than a few guys that swear 1/8 is the way to go.

Thanks to everyone for their replies, they are sincerely appreciated. Keep 'em coming!
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"LONG LIVE THE FN-BROWNING-SAIVE HIGH POWER"

John Browning & Dieudonne Saive's Designs Will Always be Light Years Ahead of All the Others.

Fighting Anti-Gun Tyrants & Traitors is a 24/7 Job that Must be Done!

I'd rather beat a bad guy to death with my Browning High Power, than shoot him dead with a plastic pistol.
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