AR-15 Talk AR-15 General Interest

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Old 03-22-2010, 17:38   #1
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Hey guys... 1/7 or 1/9 twist with 55 gr...

Hi guys... new here.

I have a Ruger Mini Target that is 1/9 twist and shoots just under MOA with my Winchester 55 grain sp ammo... (I bought 2500 rounds for 800 bucks - couldn't pass it up)

I am currently WANTING TO BUY a new OR "slightly used COLT AR-15 - 20 inch HBAR .... Should I try to stick with the 1/0 twist AR-15 with the 55 grains?

Thanx!!

Keith
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Old 03-23-2010, 17:38   #2
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1/0 twist? what are you talking about 1/7? I have a Noveske 1:7 twist. It shoots 62 gr accurate as ****. I was shooting Silver Bear and Prvi. I have shot some 55gr Fioccichi(or however its spelled) with about the same accuracy. I would go ahead and get the 1:7. I was worried about getting my Noveske and love it!
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Old 03-23-2010, 18:42   #3
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Thanx Tlwest86 ... I meant 1/9 ... sorry!

But I guess from 10 -250 yds, the 1/7 will be just as accurate with 55 grains...

Keith

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Old 03-23-2010, 19:06   #4
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First off, by no means am I an expert and I have limited experience. I however did a lot of research before spending a boat load on my gun and soon to be glass. I, however, see no difference from a 55 gr then a 69 gr in my 1:7 barrel. The 1:7 is suppose to be better for the higher grain weight. I have heard alot of ppl on ar.com say they had 1:7's that shot 55gr better then their 1:9's and that their 1:7's would shoot the 55gr better then 75gr. I would just make sure to get a good barrel..if you can't find the Hbar in Canada check out Noveske. If you got a deep wallet you can never go wrong with a Noveske. LOVE MINE! Be a badass and get the the 14.5 inch Noveske Afghan with the DD 14" lite rail. DrewArtist and I talked about doing that for my build but I didn't have the balls. Either way I would say get the 1:7...who knows maybe one day you will start reloading and then will have the ability to shoot heavier loads. RainierArms make 1:8 twist barrels. They use Shilen blanks. You can't go wrong there, that was my second option. I just like that Noveske had the gas block pinned.

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Old 04-13-2010, 16:15   #5
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1 In 7, 8 or nine will all handle 55 grain bullets just fine. I've had two 1 in 9 twist AR uppers and they both shot 55 grains with no problem. I currently have a 1 in 8 upper and it also shoots 55 grains without any trouble at all
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Old 04-18-2010, 13:17   #6
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Originally Posted by SQUAREHEAD View Post
Hi guys... new here.

I have a Ruger Mini Target that is 1/9 twist and shoots just under MOA with my Winchester 55 grain sp ammo... (I bought 2500 rounds for 800 bucks - couldn't pass it up)

I am currently WANTING TO BUY a new OR "slightly used COLT AR-15 - 20 inch HBAR .... Should I try to stick with the 1/0 twist AR-15 with the 55 grains?

Thanx!!

Keith
I have read the original M-16 used in Viet Nam was 1-12 ? The issue ammo was 55grains .

Uncle only went to a faster twist , when he changed to a 62 grain bullet . I can not remember what the twist was for the M-16-A2 ?

So , either 1-9 or 1-7 will be PLENTY fast twist for 55 grain bullets .

My bet is the 1-7 is only needed for the very heavy bullets used in long range ( as in up to 1,000 yards ) High-Power competition ?

If you have any problem with 55 grain bullets in 1-7 barrels , I would guess it would be from spinning the bullet too fast ? I have read , if the jacket is too thin / weak , that the bullet may spin it self apart before it reaches the target ?

God bless
Wyr
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Old 04-18-2010, 15:36   #7
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The weight of the bullet isn't the factor. It's actually the length of the bearing surface of the bullet that makeds the difference. Generally speaking the heavier bullets have a longer bearing surface and they work better in a tighter twist barrel.
The best overall twist for the AR15 / target and target rounds is the 1:8 twist IMHO. The 1:8 works well for the 62-69 gr bullets.
The 1:7 was developed more for the 69-77 gr rounds
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