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To flute or not to

I've built a couple of 7mm Rem Mags with 10-fluted Kriegers that shoot really great groups for their owners - and they look neat, which I've always thought was one of the reasons people really wanted the flutes in the first place.

OTOH, I ordered in a factory fluted Krieger 6.5mm blank in medium Palma contour for another customer several years ago, then wound up buying it back from him when he ran into $$ problems. I chambered it in 6.5x47, fitted it to a trued M700 in a laminated wood copy of the McM A5, and proceeded to try to find a good load for it. That SOB turned out to be one of the pickiest bbls I've ever chambered - I found exactly one load that shot acceptably well out of it.

Right now, I've got a Howa long action out in the shop that I fitted a Krieger in 280 AI for. The blank was ordered in as a #5 sporter, but when I opened the box, it turned out to be a #6 sporter, which is considerably heavier than I wanted. I've been thinking about sending it out to one of the shops I trust that specializes in fluting bbls & bolts, and having them do the 10 flute pattern that Krieger offers in an effort to reduce weight - may go ahead with the plan, since I doubt seriously that I'll ever be able to sell it as-is. Should do some shooting with it before to establish an accuracy baseline, then I'd have an idea whether the fluting hurts accuracy or not.

Dennis,

Do you trust me? Lol.:D:Do_O

Paul

www.boltfluting.com
 
Good one Boltfluter.

I like flutes on carry rifles.Anything to shed weight.But if it's a bag gun showing up with equipment on a custom cart?Maybe to make weight limits?But folks were making weight before fluting.

I like fluting,and will continue its application on hunting rigs.
 
Last trip to the Super Shoot I got to visit with Tony Boyer. He told me his gunsmith flutes all of his barrels.

I got the same advice from Dan Lilja many years ago and Bartlein recently.
 
The perfect shape for a barrel is cylindrical. Adding or subtracting from that cylinder just introduces another variable in my opinion.
There are already enough variables to deal with without introducing more.
 
Bartlein Barrels:
"Fluting will remove steel from the barrel making the barrel lighter and henceforth help make the rifle lighter overall as well. It will give the barrel more surface area which can help it cool a little faster".

Krieger Barrels:
" Flutes aid in cooling a barrel by exposing more surface area to the outside air. Flutes can also increase the rigidity to weight ratio of the barrel, thereby reducing barrel vibration and whip over a barrel of the same weight un-fluted".

Lilja Barrels:
"There are two advantages to using a fluted barrel. Improved accuracy because of increased barrel stiffness. If we compare a fluted barrel to one that is not fluted, both weighing the same, the fluted barrel is stiffer. This is because the fluted barrel will be of a larger diameter than an un-fluted barrel of the same weight and length. Increasing the diameter of the barrel greatly increases its rigidity. Another advantage is the increased cooling rate of the barrel because of the greater amount of surface area exposed to the air".

So…. WoodchuckWhacker, if you have experience and knowledge that our barrel makers do not have, feel free to entertain us and share that knowledge.


IMO it's all a marketing scheme. I have heard arguments for and against it all. The one thing that we can Not argue is that it decreases the weight and that is usually a good thing. I would not be surprised to see world record holders use them or not. I wonder if even the difference is measurable???
 
Flutes are like flames on a hot rod . Just for looks . Everyone that thinks it removes weight are correct but a few ( if that ) ounces are better removed elsewhere . Not inducing another variable , consistent depth , width , degrees centered , length etc to the most important accuracy part of the rifle .
 
I just got done reading Chapter 11 of Modern Advancements in Long Range Shooting (volume 2) by Bryan Litz. Anyone that is a fan of fluting I would recommend that they read chapter 11 and especially figure 11.11 on page 258.
 
I just got done reading Chapter 11 of Modern Advancements in Long Range Shooting (volume 2) by Bryan Litz. Anyone that is a fan of fluting I would recommend that they read chapter 11 and especially figure 11.11 on page 258.
I don't read the nonsense PRB has to say.
 
Barrels of equal contour- the fluted one is less rigid
Barrels with any stress- fluting will distort the bore
Fluting with heavy cuts and heat can induce stress

I use fluted barrels on hunting rifle where we are trying to save weight. In reality its for looks 99% of the time. I never use them on BR or F-class rifles. I do not like to flute after the barrel is made. Not all manufactures flute before the barrel is rifled. If I need a fluted barrel I will use Brux or Rock creek, they both flute before the rifling is cut and final lapping is performed. Krieger flutes as the last step. Assuming done correctly and theres no stress in the steel then there shouldnt be a problem. Typically to save weight I would prefer to use a smaller contour.
 
When I visited with Tony and Faye at the SS in the mid-nineties all of their barrels I saw were fluted. I also had a full head of hair and a full, jet black beard and mustache. These days I am going with very thin on top, and my color preference for facial hair is a white/gray mix.

One of these days I will share the method Savage uses to flute their barrels.

Things change.
 
When I visited with Tony and Faye at the SS in the mid-nineties all of their barrels I saw were fluted. I also had a full head of hair and a full, jet black beard and mustache. These days I am going with very thin on top, and my color preference for facial hair is a white/gray mix.

One of these days I will share the method Savage uses to flute their barrels.

Things change.
With all due respect, that was 20 years ago. Supposedly Skip Otto favored fluted barrels for competition........but he did them himself. If TB was still using fluted barrels, you can bet half the firing line would have them......they don't.
 
The times I saw Tony shoot, never saw a fluted barrel. In fact I never saw many fluted barrels in short range BR. Now I only went to the nationals a couple of times. But seeing there are big points for winning shooter of the year, I would bet they are shooting the best barrels they own. Matt
 
Carl Hildebrandt and I were friends in the PS days. He was head of R&D for Savage for many years. When Ron Coburn was running Savage, he and Carl used to go to used machinery/equipment sales in the NE. H&R went out of business in the early nineties (iirc) and they went to the auction. Carl points to a piece of tooling and tells Coburn "Buy me that...". He did, and Carl hauled it home. Several days later he called Coburn down to the Custom Shop to show him what he had bought. H&R made these cute little revolvers, and like most, they fluted the cylinders. Carl had modified it to cut all the flutes at one time on rifle barrels. The jig allowed Savage to fit the barrel to the action first, then flute. Carl believed, as I do, that cutting all the flutes at one time equalized the stress on the barrel. The test data he shared with me seemed to prove that concept. They shot barreled actions in their test facility, unfluted, and kept track of the accuracy. They then fluted them, and shot them again to compare accuracy. He said accuracy was improved in most cases, and not degraded in any of them.

Cutting flutes one at a time will induce barrel stress. I would think rotating the barrel 180-degrees would minimize it; and cryo-ing it should eliminate that.

I have a Pence cut-rifled 338 barrel that Skip fluted. As soon as I wear my current 338 LM barrel out it is going on.

Yes, things do change. People once believed that one reason 700's did not shoot as accurately as single shot 40X's was because loading and ejection ports allowed more flex. Not we know that the more ports you can cut in an action, the more accurately and consistently it will shoot. At least that would be the reason for the RB, LP, LE trend. Or is there another answer...?
 
I just got done reading Chapter 11 of Modern Advancements in Long Range Shooting (volume 2) by Bryan Litz. Anyone that is a fan of fluting I would recommend that they read chapter 11 and especially figure 11.11 on page 258.


I am glad someone pointed out this chapter in BL's book. It dispels every supposed benefit mentioned here with actual testing. Its a must read for anyone wanting to re-barrel. In the end the only benefit is lighter weight and oh yeah, it looks cooler.
 
Yes, things do change. People once believed that one reason 700's did not shoot as accurately as single shot 40X's was because loading and ejection ports allowed more flex. Not we know that the more ports you can cut in an action, the more accurately and consistently it will shoot. At least that would be the reason for the RB, LP, LE trend. Or is there another answer...?
The dual ports are for shooting faster. A fired case is coming out the one side while you are putting in a new one. They don't get in each others way. It also frees up your non bolt hand to put the shells in. The bolt hand can now stay on the bolt and shut it right away. It is faster then having to remove your hand put in a shell and go back to the bolt to shut it.

Plus if you look at custom actions the ports are cut in the sides. It let's metal on the top of the action like a bridge. The cuts are also smaller and not over the top like a Remington and most are single shots with solid bottoms. Now you get more bedding area and a stiffer action. Matt
 
thanks, I think. If a computer simulation says so, like everything on the Internet; it must be true. Of course, scientists also proved that Bumblebees are too unaerodynamic to fly.

I stand by the only empirical data produced. That by Savage 25 or so years ago. This would be a good time for someone to fit, chamber, and headspace barrels to an action; then fire them. Then flute without removing the barrel from the action and retest.

Since that is not likely, all we have is conjecture and opinions. That, and the fact that it costs well over $100 to flute a barrel weighs heavily in the process.

I could very well be wrong, I've been married twice, so my judgment is occasionally suspect.

Now to the idea of bottom ports...
 
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