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Fluted heavy barrels

This is a discussion on Fluted heavy barrels within the Accuracy forums, part of the M14 M1A Forum category; My only issue with fluting is that during the process you can impart stresses on the barrel itself that is not good for the barrel. ...


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Old March 10th, 2011, 03:49 PM   #16
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My only issue with fluting is that during the process you can impart stresses on the barrel itself that is not good for the barrel. Their are ways to do it properly and the point can be argued many ways. Also the depth of the cuts is very crucial, too deep you weaken the barrel too shallow and you just waste money. That said it can be great way to have a more ridgid barrel but lighterweight. I prefer non-fluted simply because I cannot justify the extra money usually spent for the limited loss in weight or gain in heat dispersion.

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Old March 11th, 2011, 09:26 AM   #17
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Flutes

Although not specific to M1a/M14, I'll be putting 1st shots through a Savage, Heavy Fluted barrel in .308 this week-end, weather permitting. It's attached to a Mod 10 Accu-stocked bolt gun. 24" barrel. Breaking the barrel in with DAG just to get her on paper. Gold medal match, 168's to see if she'll group. 100 & 200 yards. I'll keep in mind what I've read here today. Should be interesting.

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Old March 12th, 2011, 06:29 AM   #18
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I think that ********was one of the first too flute a heavy barrel on our rifles there is pic's on his web site if he still arround its been a very long time.

I question the extra cooling ability with the m1a/m14 there is a handguard over the top,


Last edited by Hawk; March 12th, 2011 at 02:27 PM. Reason: Please do not attempt to beat the censor.
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Old March 12th, 2011, 07:04 PM   #19
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Originally Posted by B 2/75 View Post
Not sure I get it.
Can anybody explain what practical benefit, if any, the removal of a couple of ounces of metal from the barrel will have, besides saving a couple of ounces of weight?

I can think of a couple of probably obvious potential drawbacks, impaired accuracy / consistancy being one...

Other than the obvious reasons mentioned already, like cooling, and weight, and perhaps rigidity from the ribs structure, I would think it might be practical from the standpoint of harmonic vibration cohesiveness in the barrel. Time will tell, and I too would be interested in getting a couple of these to try out. One of each length to properly check it out right.

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Old March 12th, 2011, 10:38 PM   #20
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Quote:
Originally Posted by ripsaw View Post
Other than the obvious reasons mentioned already, like cooling, and weight, and perhaps rigidity from the ribs structure, I would think it might be practical from the standpoint of harmonic vibration cohesiveness in the barrel. Time will tell, and I too would be interested in getting a couple of these to try out. One of each length to properly check it out right.
Maybe even fluting his modified medium weight to get close in weight to the standard barrel. Now that would appeal to me for a carry 14 while wandering around the senderos in SoTex by Laredo. I will buy one if he flutes his modified medium weights. Maybe there is no room around the barrel to flute.

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Old March 13th, 2011, 09:25 AM   #21
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I know a guy in Erie, Colorado who has a machine for fluting barrels and I asked him if it could be done on a heavy barrel. He said yes, he also said that SOMETIMES the barrel shoots less accurately. It doesn't happen very often, but it does. I was looking at having it done about a year ago. It was just cost prohibitive for me.

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Old March 14th, 2011, 08:06 AM   #22
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what about cryo or heat treat after fluting?

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Old March 29th, 2011, 10:34 AM   #23
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Originally Posted by gunnutbmg View Post
the extra surface area adds stiffness to the barrel
it is like having a 2" dia. barrel without the extra weight
they also help with heat removal from the barrel buy way of the extra surface area
not somthing that everyone will want but it would be a good option for bench/target and long range shooters
That is a very good point! That never occurred to me, thanks for the enlightenment!

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Old March 29th, 2011, 06:17 PM   #24
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Here is a good article on barrel fluting.

Is Fluting a Good Idea? Does it Make a Barrel Stiffer?
There are many popular misconceptions regarding fluted barrels. First let us say fluting is done primarily for weight reduction and esthetic reasons. It is generally not a great idea to flute a match barrel unless this is necessary to “make weight” with a given barrel length and contour. If you are sure you want fluting, it is best to start with a cut-rifled barrel because the fluting can be done by the barrel-maker before the bore rifling is cut; therefore there is no chance that fluting can harm bore uniformity. By contrast, a button-rifled barrel can be fluted only after it has been rifled and stress-relieved.

Fluting and Barrel Heating: Many people ask “Won’t a fluted barrel cool better?” The answer is maybe. Depending on the shape and depth of the flutes, fluting can increase the overall surface area of the barrel. Provided there is good airflow around the barrel, this can enhance the barrel’s ability to transfer heat. However, bead blasting a non-fluted barrel can work just as well. Moreover, you must remember that fluting reduces total barrel mass. A metal object of lesser mass will heat up faster than one of greater mass. So, with fluting, your barrel may shed heat a bit faster, but it may also heat up more quickly in the first place.

Fluting and Barrel Stiffness: Fluting does not make a barrel stiffer. However, the weight reduction allowed by fluting permits you to start with a heavier barrel contour and end up at the same weight as an un-fluted barrel of a smaller diameter contour. This may result in slightly better rigidity, but extra stiffness is not something you can count on. Look at winning guns on the firing line at short- and long-range benchrest matches. Only a small fraction of the barrels will be fluted, and usually those started out as very heavy or very long blanks and the fluting was needed to meet weight limits or to reduce the load on the receiver. A better way to hang an extremely thick, heavy barrel on a long-range benchrest gun is to use a bedding block. This supports the barrel immediately in front of the receiver for five to eight inches.

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Old March 29th, 2011, 06:58 PM   #25
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Has anyone ever mass produced a heavy M14 barrel with flutes in the section before the gas cylinder? I think I recall seeing pictures of one on the internet somewhere, but I could not find it again - it was probably a one-off custom job though. Just seems like something that might be useful to reduce weight, and have near the stiffness of a heavy barrel with extra cooling.

If anybody has one, could you take a picture?
I'm sure you seen that picture in the Texas M1a's Warbirds PICS.

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Old March 30th, 2011, 01:07 AM   #26
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Originally, in the way back days, fluting was a way to get a hevier, stiffer, barrel without adding an extraordinary amount of weight. The "bull barrels" were actually tapered, then came "varmint bull barrels" that were untapered, and afforded less muzzle whip, then they made solid 1"od barrels, but the rifles got less fun to carry around. Fluting was a way to get the max OD benefits, and cut the weight. Cooling was an after benefit. That's the way I followed the progress anyway.

I have never seen fluting negatively affect accuracy first hand. I have although, cut many a 26" bbls on Remy 700 VLSs down to 19.5" and cut an 11 degree crown on them and they shot much better. It's all in the whip/harmonics. I also had a bench pistol made from a model 7 based xp100r that had a custom barrel that was a 2x4x15.5" block of steel in 7mm-08. It would shoot 1/4 moa and that sold me on the harmonics/whip therory.

I have heard that if the flutes are not cut right it could create stresses that wander around based on temp. This allegedly is caused by poor tooling, rushing the job (heat) design, etc. From what I understand Cryo takes this into account as a fix. Never messed with it personally though

My darn rifle shoots good now and I hate to mess with it, but I sho nuff have a hankerin for an 18" heavy fluted bbl from Jon.


Last edited by 7.62bthp; March 30th, 2011 at 01:19 AM.
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