Anchutz barrel making "special process"

[tooter]

Anyone know if this "special process" is marketing hype or is there something of real value? I've seen this statement repeatedly in their product literature and am curious. Are their barrels button rifled , cut or hammer forged?

A while ago I read the article "Harvey's Hot Rod Anschütz BR-50" here on the 6mmbr that talked about Benchmark barrels being finished lapped to produce a slight taper between the breech and last 4 or 5 inches of the muzzle. I can't believe Anchutz is doing anything like this in production.

6mmbr is a great site and I learn so much from these the forums I just want to say

"Thanks",

Tooter

 

[RichinKansas]

All I know about there barrels is the knob on the end is to produce a choke in the end of the barrel. By leaving the muzzle larger diameter and removing less material the interior is supposedly a bit tighter. Understand if shortening a Anshutz barrel it is better to take off the chamber end. Their barrels are very good and perhaps the best factory barrel you can get. Like all manufacturers they are not all equal when it comes to accuracy. I think most of the ARA and IR 50/50 crowd ends up replacing them with a custom barrel. But until you get a barrel tuner on one and test with Eley and Lapua you can't know how good it might be. Lapping a barrel before cutting and chambering can make a barrel better, but shooting the gun 30,000 rounds or so does the same thing and more fun. ;D

 

[LongRiflesinc]

I worked for the Anschutz National Service center as a gunsmith. I've met Deiter and spoke with him often off/on over the last ten years.

To the best of my recollection the swelled cylinder on the end of an Anschutz barrel is to put the front sight at the appropriate height with the rear and to add a bit of "bob weight" to the end of the muzzle so that the gun hangs better in the standing position.

This would apply to the position rifles for 3P.

In all my conversations with Deiter Anschutz it was never suggested that it was to choke the bore. It may indeed be a byproduct, but then I'd be curious to know how it was done on the older 19 series rifles. Those have a straight cylinder.

I'd be inclined to think that a choked muzzle is the product of careful lapping.

As far as marketing hype you need to understand that the bulk of Anschutz advertisement is generated in German and then translated to English. (just try reading a service manual once!) Not everything they publish comes out exactly right in the translation. "Special process" sounds "Germlish" to me for "match grade barrel."

Hope this helped.



Hope this helped.

C

 

[msnations]

If you slug an anschutz barrel it becomes obvious that the choke isn't the product of lapping. The barrels are pretty smooth until you reach the 'choke' which is a really abrupt change. My best guess is they roll the barrels in a hydraulic press to get it that tight. Who knows. Taper lapping is a very time intensive process that would be very costly for Anschutz to implement...

-Mark

 

[Bob3700]

C,

I am curious about your comment on the 1900 series Anschutz rifle bbls and their build in choke.

My 1913 barrel is not a straight cylinder. It has a reduced diameter until the muzzle and then gets larger for 3 to 4 inches.

It makes sense that the larger diameter bbl will help align the front and rear sight but it would seem that the interior bore diameter would also reflect the change in bbl OD. (the bore under the larger muzzle would be smaller)

I have not slugged the bbl to actually "Feel" the choke but I'll bet it is there.

On a cut rifling centerfire bbl with a band mount for the front sight, you can feel the bore get tight at the muzzle (right under the sight band) when you slug the bore.

Bob

 

[LongRiflesinc]

Bob maybe I have my models goofed up.

18 series?

I know the 1913, 2013, etc has the enlarged contour. I likely have my #'s goofed.

Sorry for the bad scoop.

 

[tenpointnine]

Anschutz choke
The bulge at the end of an Anschutz barrel is what forms the 'choke'.
This is because button rifled barrels have stresses in them from the button being pulled (or pushed) through the barrel.
When the outside diameter is then turned down, the internal diameter (the bore) increases fractionally, through the release of these stresses. (As I understand it).
The bore is therefore made tight during the rifling process, and when the outside diameter is turned down to the final size, it opens up slightly. The bulge that is left at the end retains its tight dimension, relative to the rest of the bore, and thus is classed as being 'choked'.

If the barrel is cut down, then you lose this 'choke'.

I appreciate that some barrels may have their choke produced by careful lapping and / or slugging the barrel before chambering, so that you can find any tight spot in the bore to use as the muzzle (if barrel length allows), but the question was about Anschutz barrels.

Walter in England

 

[msnations]

If the barrel is cut down, then you lose this 'choke'.

I've heard that before, so i took a barrel and turned the end down to the minor diameter...choke was still there. I'm pretty confused about the whole thing...

-Mark

 

[JabaliHunter]

I think I read that Lilja makes a choked .22LR barrel - there may be some info on their site...

 

[tenpointnine]

The following paragraph is taken from the Border barrels site:
"When contouring a barrel, a lot of metal is removed and if there is any stress in the metal then this is relieved by the removal of material. This may result in a barrel that started out as straight ending up as bent. This is not usually a problem when cut rifling a barrel as this does not induce any stress, but button rifling induces a fair amount of radial stress which is relieved by turning the barrel down. What happens then is that as you remove metal from the outside so the dimensions on the inside grow larger. If you turn a sporter barrel with a skinny muzzle from a buttoned blank then you find the barrel is bell mouthed and the bore diameter is a thou' or more bigger at the muzzle than the chamber - definitely, not good! Buttoned barrel blanks have to be stress relieved before profiling to prevent this expansion at the muzzle."

http://www.border-barrels.com/articles/bmart.htm

Perhaps the barrel you turned down had been stress-relieved?

Walter

 

[msnations]

Walter - good catch. I assumed from the beginning that the barrel had been stress relieved...mainly because it is so standard among American barrel makers. In addition, I'm not sure whether or not Anschutz barrels are even lapped. The process would probably start removing the anschutz choke from the muzzle.

Still pretty confused

-Mark

 

[xpfuzz]

I have an 1813 series and it has the (Swell) at the end of the barrel,,and I`m still confused... ;D

 

[Bob3700]

The "Swell" at the end of your 1813 barrel is what causes the choke or smaller diameter at the muzzle.

With the bullet being made of "Dead" metal, you want the smallest bore ID at the muzzle. That way the bullet is swagged down at that point with the best gas seal.

Bob