Barrel Questions > Rifles, Uppers, Lowers, Barrels, and more

Posted: 1/5/2012 6:24:32 AM EDT

Hey all -

These are probably newbie questions but I've never really looked into barrel twists.

1/7, 1/8 is the same as 1:7, 1:8 and means twist over number of inches, right? So a 1/7 barrel has one twist over 7 inches and thus a tighter rifling than 1/8, right?

The reason this matters now is that I have two barrels, 1/7 and 1/8 and am wondering which I should put on my rifle. Both are ported and chrome lined.

Any thoughts?

Andy

Posted: 1/5/2012 6:40:27 AM EDT

[#1]

1/7 and 1:7 mean the same thing, which is one rifling turn in 7 inches.

Flip a coin.

Posted: 1/5/2012 6:45:42 AM EDT

[#2]

tighter twist=stabilizing heavier bullets at longer distances

there are calculators you can use to determine twist needed...or you can just add it to your post and most will know offhand

Posted: 1/5/2012 7:40:50 AM EDT

[#3]

OP,
A while back I remember reading something about some flavors of the 1:8 barrels having tighter .223 match chambers. This might cause issues with mil spec 5.56. Others with hands on experience with this issue will be able to offer more specifics but you may also wish to consider chamber dimensions when making your decision.
FWIW
YMMV

Posted: 1/5/2012 8:00:51 AM EDT

[#4]

I would have to build two. But all things being equal I would go with the 1:8. It's not much difference but you will have a little more selection of bullet weights. You might loose a little at the top end but you gain a little at the bottom end.

Posted: 1/5/2012 8:08:50 AM EDT

[#5]

I don't think you'll see much of a difference between the 1/7 and the 1/8. I'm running a 1/7 barrel on my AR and have no problems shooting anything from 55 grn all the way up to 77 grn 5.56 rounds.

Posted: 1/7/2012 9:25:34 PM EDT

[#6]

1/7 will shoot everything 1/8 will probably shoot anything your going to use.
id use the 1/7

Posted: 1/7/2012 10:16:19 PM EDT

[#7]

most 1:8 barrels are really 1:7.7

both will stabilize pretty much everything on the market over any practical distance

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