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Old 07-09-2014, 19:18   #1
Dalton Wayne
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1/9 twist or 1/7

Whats the difference, what do you prefer
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Old 07-09-2014, 19:45   #2
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Whats the difference, what do you prefer
Barrels with a 1:7 twist can stabilize ammo up to 77gr. very well. Barrels with a 1:9 twist can stabilize ammo up to 62gr. well.

I prefer a 1:7 twist on some ARs, but for the average plinker and HD AR, 1:9 in just fine.
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Old 07-09-2014, 20:48   #3
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Barrels with a 1:7 twist can stabilize ammo up to 77gr. very well. Barrels with a 1:9 twist can stabilize ammo up to 62gr. well.

I prefer a 1:7 twist on some ARs, but for the average plinker and HD AR, 1:9 in just fine.
69 grain SMKs will stabilize in a 1/9 just fine, but anything longer is going to be dicey and depend on the individual barrel. I have heard of some people having luck with 75 grain Hornady OTM out of 1/9 barrels, but haven't tried it myself.

Personally, I go no slower than 1/8. A good 1/7 barrel can still run 55 grain well enough (usually 2-4 MOA in my experience, but XM193 isn't exactly match ammo), and gives you the ability to run the longer projectiles that tend to perform better for self defense or at distance. 70 grain TSX and 77SMKs will both need at least a 1/8 barrel.
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Old 07-09-2014, 20:50   #4
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1:9 is fine for most folks. The majority of the range fodder out there is 55 and 62g anyway, and 1:9 shoots both of those great.
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Old 07-09-2014, 20:53   #5
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1:9 is fine for most folks. The majority of the range fodder out there is 55 and 62g anyway, and 1:9 shoots both of those great.
1/7 will handle them just fine as well, plus opens up the ability to run heavier projectiles.

In my opinion, there's no reason to not go 1/8 or 1/7 unless you're planning to shoot a lot of projectiles in the 40-50 grain range.
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Old 07-09-2014, 22:08   #6
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1/7 Is what I have, why that is just what the rifle came with. I have shot 55fmj just fine all the way up to 69gr. Most of what I shoot is 62gr federal. Also keep in mind its more of how long the bearing surface is on a bullet,not so much its weight.
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Old 07-09-2014, 22:09   #7
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1/7 in both of mine and the half dozen that came before them.
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Old 07-09-2014, 22:17   #8
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I have a 1-9 and 1-8.
The 1-9 actually shoots 77's well to the 400yd targets.
The 1-8 does well even with the 80's.
If your not planning on shooting the bigger bullets a 1-9 is a good option.
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Old 07-09-2014, 22:22   #9
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I have a 1-9 and 1-8.
The 1-9 actually shoots 77's well to the 400yd targets.
The 1-8 does well even with the 80's.
If your not planning on shooting the bigger bullets a 1-9 is a good option.
Barrel length? What altitude?
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Old 07-10-2014, 07:40   #10
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barrel length? What altitude?
16"

1200'

I do realize that it's not the norm, that barrel is also freakishly accurate for a chrome lined barrel and gives my spendy ultramatch barrel a hard time.

For a do it all safe bet a 1-7 or 1-8 is a good choice.
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Old 07-10-2014, 10:47   #11
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1/7 for me. Fine with 55 and 62 and great with the heavier bullets. Especially since I reload.

Either is ok with 55 and 62 in my experience. It really just depends if your going to shoot <55 a lot (1/9) or 62< more frequently (1/7).
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Old 07-10-2014, 17:30   #12
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16"

1200'

I do realize that it's not the norm, that barrel is also freakishly accurate for a chrome lined barrel and gives my spendy ultramatch barrel a hard time.

For a do it all safe bet a 1-7 or 1-8 is a good choice.
It's definitely unusual that you're seeing 77s stabilize at that altitude from a 16" 1/9.
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Old 07-10-2014, 17:39   #13
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A 1:7 stabilizes the 62gr bullets I shoot and it will also stabilize anything heavier so that's what I prefer.
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Old 07-10-2014, 19:37   #14
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I have run my 20" Hbar with a 1-9" barrel out to 600 yards with 77 and 79 grain bullets just fine. Anything heavier and accuracy falls apart. That gun is a near clone of my DCM match gun, except the DCM gun is free floated with a compass lake 1-8 barrel.


If you plan to shoot light weight bullets a 1-9 will be just fine. You may get lucky and have it run heavier bullets. Some do, some don't. The 1-7 will be good for the heavier bullets, but may not do well with 55-62 grain bullets.

If you are unsure about what you will be shooting. Split the difference and go with the 1-8. It's a good all around barrel and will be found on most match rifles. Just be sure you get a gun with a 5.56 chamber. If you get one in .223 and try to shoot 5.56 through it. You are asking for a blow out. Barring a 5.56 chamber, a Wylde will do.
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Old 07-11-2014, 08:48   #15
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The original M16A1 had a a twist of 1-12 and most commercial .223 caliber rifles today will have a twist of 1-12. When the M16A2 made its debut in the early 80's the MILSPEC changed to 1-7 to accommodate the new military standard 62 grain M855 cartridge. Prior to that it was almost impossible to find a .223 barrel from anyone with anything other than a 1-12 twist. Custom barrel makers-yes. But nothing production.

The 1-12 did fine with all the mid to light weight .223 bullets and of course its preferred fodder in an M16A1 was a 55 grain bullet. FWIW the standard match load at the time was a 52 grain Sierra Match King which did fine at 200, mediocre at 300 and was miserable at 600.

Bushmaster was one of the first to introduce the 1-9 twist to the commercial market and it does just fine with 62 and 69 grain bullets. Many many Hi-power matches have been won with 1-9 twist barrels and 69 grain Sierra Match Kings.

The 77 grain bullets took over the long range game for good reason but they pretty much need a 1-7 twist. But most of those 77 grain loads are match grade ammunition and run about a $1.20 a pop. Not many people will be shooting those much...

For the vast majority of us the 1-9 twist is perfect as it handles the spectrum of cheap MILSURP ammo perfectly and as my experience shows can also do great work with the 69 grain match loads (again, we are talking ammo that exceeds $1 a shot).

I feel that the 1-7 doesn't yield the best results with 55 grain ammo for sure. I've never found a 1-7 twist gun that could out shoot a decent 1-12 twist gun with the same 55 grain ammo.
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Old 07-11-2014, 09:03   #16
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The original M16A1 had a a twist of 1-12 and most commercial .223 caliber rifles today will have a twist of 1-12. When the M16A2 made its debut in the early 80's the MILSPEC changed to 1-7 to accommodate the new military standard 62 grain M855 cartridge. Prior to that it was almost impossible to find a .223 barrel from anyone with anything other than a 1-12 twist. Custom barrel makers-yes. But nothing production.

The 1-12 did fine with all the mid to light weight .223 bullets and of course its preferred fodder in an M16A1 was a 55 grain bullet. FWIW the standard match load at the time was a 52 grain Sierra Match King which did fine at 200, mediocre at 300 and was miserable at 600.

Bushmaster was one of the first to introduce the 1-9 twist to the commercial market and it does just fine with 62 and 69 grain bullets. Many many Hi-power matches have been won with 1-9 twist barrels and 69 grain Sierra Match Kings.

The 77 grain bullets took over the long range game for good reason but they pretty much need a 1-7 twist. But most of those 77 grain loads are match grade ammunition and run about a $1.20 a pop. Not many people will be shooting those much...

For the vast majority of us the 1-9 twist is perfect as it handles the spectrum of cheap MILSURP ammo perfectly and as my experience shows can also do great work with the 69 grain match loads (again, we are talking ammo that exceeds $1 a shot).

I feel that the 1-7 doesn't yield the best results with 55 grain ammo for sure. I've never found a 1-7 twist gun that could out shoot a decent 1-12 twist gun with the same 55 grain ammo.
Thought I ad that alot of 22-250's and 220 swfits had 1-14 twist and shot 55 grain bullets just fine.
Some how 1-9 twist got known as a slow twist when it is a fast twist



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Old 07-11-2014, 09:33   #17
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I standardized with 1-7 for all of mine, my families and friends guns that are 16" or less. Now, when you get into longer barrels lengths, i.e. 20" or better, then you can use a little slower twist. This is due to the bullet being in the barrel longer.

I'm building a USMC SAM-R clone off a Rock River upper and lower with the 2 stage match trigger. The Marines built these with a 1-7.7 20" SS barrel using Krieger blanks. These are being taken out to 600+ meters using 75gr bullets with excellent results.
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Old 07-11-2014, 13:51   #18
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Thought I ad that alot of 22-250's and 220 swfits had 1-14 twist and shot 55 grain bullets just fine.
Some how 1-9 twist got known as a slow twist when it is a fast twist



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Early issue M16s came with 1-14 twist as well.
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Old 07-17-2014, 17:19   #19
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1:7 is more versatile if all you plan to shoot is 55gr and up. I like the ability to shoot 75/77gr accurately (1:9 theoretically can do it ok but results vary).

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Old 07-17-2014, 17:41   #20
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All mine are 1-7s but I would rather have 1-8s. I could get by with 1-9s probably (and it is more cast bullet friendly) but I like shooting 75gr BTHP bullets.
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