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Posted: 4/19/2010 5:21:38 PM EDT
i new to the ar world and building my first but im not sure which i should get , i know the 1/7 is for the heavier round . im not sure what ammo im going to be using , probably what ever is cheapest , im leaning to the 1/9 .
Link Posted: 4/19/2010 6:11:13 PM EDT
1/7 if you have the choice, they shoot 55grn just fine.
Link Posted: 4/19/2010 6:27:21 PM EDT
It also depends on the barrel choice and cost. Some aren't available in 1:7. 1:7 is popular and most everyone will say get the 1:7. I've had a bunch of 1:9s too and haven't had any trouble. Choose one. If you are going to want to shoot over 69 grain projectiles though, I'd go 1:7. If you think that you might shoot some of the lighter stuff, like 40 grain projectiles, the 1:9 would probably be better suited. You could find a 1:8 as a compromise. How's that for muddying the water?
Link Posted: 4/19/2010 6:39:19 PM EDT
ok so i can shoot 55 grn ammo out a 1/7 and it will be accurate , so why would i get a 1/9 ? only if i want to shoot very light ammo ?
Link Posted: 4/19/2010 7:10:13 PM EDT
if 55grain is gonna be what you shoot the most, go with the 1:9. This way you will be fine shooting the 45grain varmit loads, as said above, unless you plan on going over 69gr, 1:9 will be fine. I've even had great luck with the black hills 68 grain match with my 1:9 twist.
Link Posted: 4/19/2010 7:19:54 PM EDT
Most of the 5.56 I shoot is 75gr, but I shoot a significant amount of 52gr/55gr as well. I have yet to come across a 1/7 barrel that is not at the very least "combat accurate" with bullets in the 50 grain range. Molon has posted sub-MOA groups with quality Sierra ~50gr bullets out of a 1/7 barrel.

Choice of twist rate has more to do with what you want to do with the rifle and (to a limited extent) how much you want to spend than what we say you should get.

Originally Posted By bgcoop8784:
I've even had great luck with the black hills 68 grain match with my 1:9 twist.


You should have great luck with that load and twist.
Link Posted: 4/19/2010 7:46:09 PM EDT
This site is littered with that question. And others involving twist rates.
It's all in the search. Answer is always the same. And it should be Tacked.

Oh, wait nobody reads those, they just post.
Never mind
458
Link Posted: 4/19/2010 7:57:13 PM EDT
Originally Posted By 458winmag:
This site is littered with that question. And others involving twist rates.
It's all in the search. Answer is always the same. And it should be Tacked.

Oh, wait nobody reads those, they just post.
Never mind
458



i did a search and didnt come up with much , thanks for your help
Link Posted: 4/19/2010 8:27:42 PM EDT
[Last Edit: 4/19/2010 8:31:01 PM EDT by 458winmag]
Originally Posted By woodro77:
Originally Posted By 458winmag:
This site is littered with that question. And others involving twist rates.
It's all in the search. Answer is always the same. And it should be Tacked.

Oh, wait nobody reads those, they just post.
Never mind
458



i did a search and didnt come up with much , thanks for your help

No problem. This seems to come up daily. Never seem's to get Tacked. Here you go for the short history.
Edit. problems will be back. Intermission.
458


Link Posted: 4/19/2010 8:51:21 PM EDT
[Last Edit: 4/19/2010 8:54:09 PM EDT by 458winmag]
Try search by ? 1/7 or may be 1x7. You might vary the ? Don't select the 24hr. default it's not much use. I'll try again
Edit. sorry that did not work either. Try the above
458
Link Posted: 4/20/2010 7:36:03 AM EDT
Hey guy,

Here is a useful post.

You should be fine with the 1/9.

It is cheaper. It will shoot anything you can buy over the counter. It works just fine, mine have all been accurate and one was even an Olympic Arms!!!

Most of the folks here on the tech forums are vicious kool-aid drinkers. You don't need 1/7. Wouldn't the big manufacturers been putting out 1/7 all this time if it was what everyone wanted?
Link Posted: 4/20/2010 10:55:55 AM EDT
1/9 is fine until you go with the longer bullet profiles. I shoot anything 62gr and below out of 1/9. Some have good results up to 75 gr.
1/7 should be fine for anything down to 55 gr.
Link Posted: 4/20/2010 11:04:29 AM EDT
I never saw the need to go with a 1:9.
Link Posted: 4/20/2010 11:52:53 AM EDT
1/8 to keep it straight
Link Posted: 4/20/2010 12:16:56 PM EDT
Originally Posted By ramennoodles:
1/8 to keep it straight


one in seven, you'll be in heaven

one in nine, you might be fine
Link Posted: 4/20/2010 3:58:02 PM EDT
Find a quality rifle you like at a price you can afford. Buy that regardless of twist rate and you will be fine.

I have shot everything from 45 to 69 grain from my 1:9 barrels with success. Most bulk and affordable ammo falls in that range so you will be fine.
Link Posted: 4/20/2010 6:03:08 PM EDT
im lookin at 2 uppers and not sure which one to get .

1st , rra upper , wilson lightwieght 1/9 twist barrel , 16 mid

2st , sabre defence , i/7 twist , 16 mid ,

both are the same price ,
Link Posted: 4/20/2010 6:10:04 PM EDT
Originally Posted By woodro77:
im lookin at 2 uppers and not sure which one to get .

1st , rra upper , wilson lightwieght 1/9 twist barrel , 16 mid

2st , sabre defence , i/7 twist , 16 mid ,

both are the same price ,


I would get the Sabre because it's probably better barrel material.
Link Posted: 4/20/2010 8:03:02 PM EDT
A few things to consider:

-Do you ever plan on shooting 75 or 77 grain bullets? If yes, you need a 1/8 or 1/7 twist barrel. 55 grain ball shoots fine in these barrels. 69 grain SMK's, OK. Heavier than that, no good.
-Do you ever plan on shooting very light varmint bullets (40 or 45 grain). If yes, a 1/7 twist barrel is tough on those bullets. You're better off with a 1/9.
-Are you getting an extremely short barrel (like 10.5 or 11.5). If so, get the faster twist rate if you're going to shooting anything heavier than 62 grain. The shorter the barrel, the lower the velocity, and the slower a given barrel / twist rate will spin a bullet.
Link Posted: 4/21/2010 3:56:15 AM EDT
I feel the 1/9 is more then fine for 99% of shooters 99% of the time but that said, when I have an option, I'd go 1/7 because it opens up your ammo options.
Link Posted: 4/21/2010 7:45:30 AM EDT
Originally Posted By woodro77:
i new to the ar world and building my first but im not sure which i should get , i know the 1/7 is for the heavier round . im not sure what ammo im going to be using , probably what ever is cheapest , im leaning to the 1/9 .


You should get the 1/7.
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