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Old August 3, 2019, 07:28 AM   #1
Bartholomew Roberts
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Structured Barrels - One Hole Accuracy and Longer Barrel Life?

https://www.thefirearmblog.com/blog/...-every-aspect/

Basically the idea is you drill a bunch of holes down the barrel and around the muzzle and you get increased stiffness and cooling, as well as very minimal “barrel whip.” The science is well past my ability to discern scam from genius; but it looks interesting if it proves true.
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Old August 3, 2019, 08:52 AM   #2
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If it is on the level, these guys would be using it. They don't

National Bench Rest Shooters Association

https://www.nbrsa.org/
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Old August 3, 2019, 11:29 AM   #3
Bart B.
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The claim is equal stiffness for barrels of the same weight and length. That's true.

Holeing or fluting a given barrel removes metal that made it stiff. There's now less metal to resist bending. They then are less stuff and bend more from forces applied.

A solid barrel properly stress relieved and fit to the action will not walk shots away from aim point starting at ambient temperature then to very hot firing several dozen shots 15 seconds apart

Last edited by Bart B.; August 3, 2019 at 11:59 AM.
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Old August 3, 2019, 01:34 PM   #4
Art Eatman
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Larger outside diameter is what makes for greater stiffness. All the holes do is reduce the weight.

Look up the engineering term "column bending". Simplest put: Think of a long tube, loaded on each end. The greater the tube diameter, the more force is required to make it crumple. And, before crumpling, begin to bend.
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Old August 3, 2019, 07:51 PM   #5
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Art, those 6 holes make the barrel less stiff plus weigh less.

Every square unit of metal cross section between bore and outer profile you remove reduces the barrel's resistance to stretching or compressing from some external force on a fixed breech barrel. The amount depends on how far each unit is, and its direction from, bore center.

What is stiffer....

A 2 foot long, 1 inch diameter 25 caliber straight barrel blank

A 2 foot long, 1 inch diameter 50 caliber straight barrel blank

A 2 foot long, 1 inch diameter 99 caliber straight barrel blank

Last edited by Bart B.; August 3, 2019 at 08:34 PM.
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Old August 3, 2019, 08:31 PM   #6
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Quote:



What is stiffer....



A 2 foot long, 1 inch diameter 25 caliber straight barrel blank



A 2 foot long, 1 inch diameter 50 caliber straight barrel blank
More appropriate, what is stiffer, 1" barrel with one hole or a 2.25" barrel with 7 holes that weighs the same?
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Old August 3, 2019, 08:49 PM   #7
Jim Watson
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Same as flutes.
I wonder if the "stiffness" is more asset than the uneven thickness is a liability.
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Old August 3, 2019, 09:04 PM   #8
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More appropriate, what is stiffer, 1" barrel with one hole or a 2.25" barrel with 7 holes that weighs the same?
2.25 with 7
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Old August 3, 2019, 09:15 PM   #9
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2.25 with 7
We have a winner.
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Old August 3, 2019, 11:20 PM   #10
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Next thing you know, someone will invent a water-cooled barrel, in order to reduce barrel temperature during matches...
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Old August 3, 2019, 11:28 PM   #11
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Well, it worked for Mr Maxim and Mr Browning. For versions of "match."
There were some cooled barrel varmint rifles for fields of prairie dogs.
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Old August 22, 2019, 04:37 PM   #12
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An airplane wing is very strong and light. Truss bridges are stronger and lighter than they would be if solid. That's what engineering is all about. I just wonder how much engineering went into the design of the drilled barrels that are just coming along.

I'd be a little skeptical about long-term pressure effects, especially near the chamber. There could be some distortion if the metal thickness isn't sufficient in that area. Perhaps the holes don't even extend to the chamber area.
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Old August 22, 2019, 08:02 PM   #13
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Well, it worked for Mr Maxim and Mr Browning. For versions of "match."
Tongue-in-cheek.
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Old August 22, 2019, 10:56 PM   #14
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A good barrel properly fit to the receiver will not shoot bullets away from point of aim very much shooting 40 shots once every 15 seconds; 4 to 5 shots per minute. Less than an inch away at 600 yards, group under 2 inches extreme spread

People testing ammo in rifles for rapid fire matches shooting 10 shots in 60 seconds at 300 yards into sub half MOA groups.
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Old August 23, 2019, 07:31 AM   #15
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If it proves out, they will sell well. My twist: "Be not the first to choose what's new, nor the last to accept the proven."
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Old September 21, 2019, 07:31 PM   #16
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never heard of this method. ive used cryo treatment on barrels and it really works. also vibratory stress treatment of barrels work. if you combine all three and use the right length of bullet to the twist of the bore and the caliber, should be a real shooter. sounds interesting. putting lots of rubber o rings on your barrel really cuts down on vibration. a cheap way to do it. works also.
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Old September 22, 2019, 07:04 AM   #17
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I want my barrels to vibrate mostly in the vertical plane so slower bullets leave at higher angles to the line of sight than faster ones.
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Old September 22, 2019, 07:07 AM   #18
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Putting Iots of rubber o rings on your barrel really cuts down on vibration.
How did you measure the vibrations?

What was the difference in resonant and harmonic frequencies as well as amplitude?

Last edited by Bart B.; September 22, 2019 at 07:14 AM.
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Old September 22, 2019, 09:41 AM   #19
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groups. much tighter groups at a distance.
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Old September 22, 2019, 10:01 AM   #20
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I'd look at "Structured Barrels" like this:

For the real professionals whose livelihood (and lives) depend on an ultra-precision and accurate weapon, how many are using structured barrels (vs. something else)?

My guess is not may.
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Old September 22, 2019, 10:04 AM   #21
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groups. much tighter groups at a distance.
That often happens with the same barrel without O rings. Proved over a century ago.

How many O rings were used, what size and spacing were they?
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Old September 22, 2019, 11:43 AM   #22
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Drilling 1 hole in a rifle barrel can potentially leave various stresses in the steel.
Would think drilling or fluting more would leave multiple times these stresses.
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Old September 22, 2019, 01:03 PM   #23
Bart B.
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Drilling 1 hole in a rifle barrel can potentially leave various stresses in the steel.
Would think drilling or fluting more would leave multiple times these stresses.
All stress from each hole can be relieved with heat and cooling treatments. Then drill the next one.

But still an expensive process with no advantage over conventional fluting costing less.

Last edited by Bart B.; September 22, 2019 at 01:11 PM.
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Old September 22, 2019, 08:00 PM   #24
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when i put o rings on, i put them side by side from infront of the forestock to about a 1 and 1/2 inches from the muzzle. tight together and double layer. then a high quality electrical tape over all of them. it is on a custom inline muzzle loader i built with a douglass barrel. my son did a 213 yard off hand shot through the neck of a huge buck with it. it drives tacks at 100 yards and of course shoots to very long ranges perfectly. every barrel i have cryo treated shoot much better after the treatment. i have a son in denver who cryo treated some rifles he has and they all shot better after the treatment.
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