What is the best rifleing

[Mram10us]

Broughton and Hart are always used in br and Williamsport world championship. If button rifle didn't shoot as well, they wouldn't be there

 

[J E Custom]

I think you'll all enjoy the following article:

3 Methods of Barrel Rifling: Pros vs. Cons
by NRA Staff - Tuesday, November 21, 2017

There are five barrel-rifling methods in general use: cut, button, broach, hammer forging and ECM (electrolytic cationic machining). All have their benefits. Today, we'll cover the first three methods.

1. Cut Rifling
Cut rifling is the oldest method of rifling a gun barrel. The cut-rifling method removes metal from the surface of the bore to create the grooves using a single-bladed, hook-type cutter of groove width that is pulled through the cold barrel. It is sometimes called "hook rifling" after the fishhook-shaped cutter used. Cutter depth is adjustable, so that it removes only a small amount of metalona pass. Each groove must be cut individually with multiple passes of the cutter. The cutter is indexed to each groove in turn and positively rotated by the rifling machine using a sine bar.

Advantages of cut rifling:

The shape and number of grooves and groove depth can be easily changed as necessary.
Rifling twist rate may be easily changed as required.
Rifling twist is consistent from one end to the other.
Little or no additional stress is imposed on the barrel.
Cut-rifled barrels may be contoured after rifling.
Close tolerance can be held.

Disadvantages of cut rifling:

The process is slow and not well adapted to mass production.
Cut barrels normally cost more due to the slower manufacturing process.
Some metal alloys can not be cut.
A mistake or machine malfunction at the end of the process can prove wasteful.
Cut-rifled barrels must be lapped.

Many target shooters prefer cut-rifled barrels for their uniformity and close tolerance. The cut-rifling method is normally used on prototype or test barrels where only a small number will be made for experimental purposes.

2. Button Rifling
Button rifling is a modern method that creates the grooves in the cold surface of a rifle bore by displacing metal using a bullet-shaped, super-hard button of tungsten carbide. The rifling button has the reverse pattern of the groove profile ground into its surface. As the rifling button is pushed or pulled through the barrel, the groove pattern is ironed into the bore surface by displacement. There are several variations in button-rifling procedure. Some barrelmakers prefer to pull the button through the bore, while others prefer to push it through. In most cases, the button remains free to rotate during this process, dependent on the angle of the grooves in its surface to cause the desired degree of rifling twist. As variations in rifling twist may occur during this procedure, some barrelmakers affix the rifling button to a rod and positively rotate it with a sine bar.

Advantages of button rifling:

The procedure is fast and very economical, as only a single pass of the button is required to rifle a barrel.
Button rifling is well suited to mass-production methods with high output.
Button rifling leaves a smooth, bright finish inside the barrel that need not be lapped.
Button-rifled barrels are very accurate.
Bore and groove dimensions are very consistent.

Disadvantages of button rifling:
Button rifling creates stress in a barrel; high-quality button-rifled barrels must be stress-relieved after rifling.
Buttons are expensive and difficult to make.
Different groove configurations and different rifling twists require a new button.
The button-rifling system is not flexible.

Button-rifled barrels can be extremely accurate; more bench-rest records are held by shooters using guns with button-rifled barrels than by any other type. Button-rifled barrels are very common on modern centerfire and rimfire guns.

3. Broach Rifling
Broach rifling is a modern, production-oriented variant of cut rifling that addresses some shortcomings of the cut-rifling process. While cut rifling uses a single-bladed cutter, a broach is a metal bar with sets of progressive cutting blades in its outer surface corresponding to the number of grooves. The cutting blades are fixed in spiraled succession, each blade cutting to slightly greater depth than the one in front of it. As the broach is pushed or pulled through the cold barrel, all the grooves are cut on a single pass. In some cases, a series of ever-larger broaches is run through the barrel until the desired groove depth is reached.

Advantages of broach rifling:
Fast and well-suited to mass-production methods.
Little or no stress is imposed on the barrel.
Rifling twist is consistent from one end to the other.
Broach-rifled barrels may be contoured after rifling.
Adequate tolerances can be held.

Disadvantages of broach rifling:
Broaches are expensive and hard to make.
Different groove configurations and different rifling twists require a new broach.
Broach-rifled barrels must be lapped.
The broach-rifling system is not flexible.
Match-grade barrels are not compatible with this system.

Because broach rifling was well-suited to high-volume production, it was the rifling system of choice in making military rifles during the first half of the 20th century. In the second half o the 20th century, button rifling replaced broach rifling for the manufacture of rifle barrels, with few exceptions. Today, broach rifling is commonly used to rifle some handgun barrels.

Thanks. this is a very good description of the different rifling processes and should answer any questions. Quality relies more on the manufacture than the process. In my opinion there are different places/needs that will bring out the best in any type of rifling so there is really no added accuracy in any one type.

There are different requirements for each type and as long as these requirements are met you should have a good barrel in ether type.
I would add that buttoned rifling "must" be re stress relieved after the button process for best results. It is also a forging process so the first few thousandths in the finished bore have a better grain structure and are known to have a slight advantage in barrel life. One of the advantages of cut rifling is the ability to cut rifling of any twist rate. (Like 1 in 9.2, 1 in 9.3, or any fraction in between even inches)

All processes benefit from pulling the button or broach rather than pushing it to prevent chatter or walking off center. pushing the button/broach is normally done on larger calibers with many lands and groves (10 +).

Also no matter what process is used, Lapping has the most desirable finish and best chance of removing any process defects.

J E CUSTOM

 

[nvschütze]

Try a 5R tube. The lands are not opposite each other as is found in a barrel of standard rifling. Makes it easier to clean...

 

[Deleted member 103481]

The kind you've got is the best kind

 

[338 dude]

Try a 5R tube. The lands are not opposite each other as is found in a barrel of standard rifling. Makes it easier to clean...

I've also heard a theory of odd numbers are better even numbers say 4 lands are opposing each other and cause more bullet deformation

 

[L.Sherm]

Rifling has nothing to do with cleaning, it's all in the lapping and finish inside the barrel.

 

[nvschütze]

Rifling has nothing to do with cleaning; it's all in the lapping and finish inside the barrel.

Far be it from me to argue with you. I wrote above what I wrote after reading the article referenced below:

http://www.wonews.com/Blog.aspx?id=2047

A second opinion: https://faxonfirearms.com/blog/what-and-why-5r-rifling/

 

[L.Sherm]

Every barrel maker is gonna make the case that theres is the best, one thing the top tier have in common is there lapping is good.

 

[L.Sherm]

Far be it from me to argue with you. I wrote above what I wrote after reading the article referenced below:

http://www.wonews.com/Blog.aspx?id=2047

A second opinion: https://faxonfirearms.com/blog/what-and-why-5r-rifling/

I can assure you if they were that much better there would be a 5R on every gun on the BR line

 

[L.Sherm]

Straight from Kreigers site, they are the only ones who have permission to make the Boots Obermeyer 5R.
Theres alot of copies out there.

 

[KyCarl]

I have a B.O. barrel on a 300WM 5R .298 X.308 26" long MTU taper.
it's a fine barrel and the rifle is a keeper! Is it any better than any other? Who knows?
But it put it's first 3 rounds in .410 at 100?

 

[sable tireur]

Straight from Kreigers site, they are the only ones who have permission to make the Boots Obermeyer 5R.
Theres alot of copies out there.

This is simply untrue, a fabrication. Boots has stated publicly that all a barrel maker has to do is ask and they can get permission use the 5R rifling form. Heavens, he even gave Remington permission to use it!

 

[L.Sherm]

Maybe things have changed but this was an article on accurateshooter in 2009 stating they( Kreiger) were the only ones approved to do Boots 5R.

 

[sable tireur]

Maybe things have changed but this was an article on accurateshooter in 2009 stating they( Kreiger) were the only ones approved to do Boots 5R.

"...they( Kreiger) were the only ones approved to do Boots 5R."

And what should be added is the rest of what the statement should read: at that time.

While that may have been true 10 years ago, it was not true then and is NOT true now after that date through today. Boots intentionally did not protected the 5R rifling form legally and stated publicly that all you needed was to discuss the use with him. Remington had a contract with a barrel maker for a limited run of 5R rifle barrels for their limited run of rifles. When that contract finished, Remington went to Boots seeking and getting permission to use that rifling form.