Russian Big Game Ammo Question – Barnaul .30-06 Case Groove Revealed

Note relief ring just above cartridge base
Note relief ring just above cartridge base

U.S.A.-(Ammoland.com)- Recently we sent out a release about Barnaul's .308 Winchester and .30-06 hunting rounds. The .30-06 is an all American round once used by U.S. Forces as a military round but no longer. It is still a popular and effective hunting round worldwide.

Barnaul produces the .30-06 using strong polycoated steel cases for reduced cost. They work incredibly well at an affordable price. However, the pressure generated by the .30-06 round is higher than other steel-cased rounds the company makes. Since steel is much harder and less malleable than brass the overall steel case expands slower in the microsecond of gas expansion in the firearm's chamber than brass cases.

To accommodate the higher pressure curve of the .30-06 round for that millisecond the engineers at Barnaul “simply” designed a slight round groove called a relief ring into the cartridge case near the base. This is roll pressed in, there is NO metal removal. Upon firing the additional pressure will be absorbed and reduced as the relief ring material is pressed out by the powder discharge basically duplicating the expansion of a brass case. Smart, simple, safe and well-engineered.

Barnaul is one of the few privately owned Russian ammunition companies who have been approved to supply their ammunition to the Russian Army. Their high standards and extreme quality control measures have also granted them the privilege to supply the Russian Special Forces with Barnaul's high-quality ammunition.


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JPM
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JPM

I shoot the steel cases in my Russian/USSR guns (SKS, AKs, etc.) but not in any other guns; I like them too much to risk damage to the extractors, ejectors, chambers or any other parts that might be damaged by using anything other than brass, by design.

Jim
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Jim

Because the Russian military and others shoot tens of millions of rounds a year in of steel cases your comment does not speak too well of the quality of our domestic guns. I shoot the hell out of this stuff in all of my Yankee made guns with no extraction problem due to the finish they put on the steel cases and pressure wise the stuff still has to make SAAMI standards.

Dave C
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Dave C

Commie guns get commie ammo – all others get brass. Commie guns are made loose by design, and can handle the varnish getting in the chamber better than one set up for brass. The first question out of a gunsmith’s mouth after a case stuck in the chamber – “have you been using commie ammo?” If you want to take a chance, go ahead. I learned the hard way.

Bill
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Bill

Cost. availability, accuracy, bullet loadings, velocity???

RoyD
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RoyD

I find this explanation of the “ring” curious as I have some of those cases that have been fired and the “ring” is not “pressed out” at all. Seems like a dichotomy given the explanation.

RoyD
Member
RoyD

I think I may have found the reason for the groove. “The Barnul ammo is the way it is because of the particular steel they use, and the geometry of their case- which is prone to cracking if there’s excessive headspace in the gun that fires it. Normal brass can stretch enough to compensate. Other steels can (probably) stretch enough to compensate. Their steel maybe can’t. As a result, Barnul felt that to not kill people with crappy guns, it was necessary to include a feature that would allow their cases to stretch without failing.” Here is a video showing… Read more »

Alan1018
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Alan1018

Better yet just buy American ammo.

Jim
Member
Jim

i wondered about that ring? Their ammo is accurate stuff and for the money spent you can keep the brass cases-=-I don’t reload. Low cost makes it easier to just go and have fun shooting too.

Dave C
Member
Dave C

Commie guns get commie ammo – all others get brass. Commie guns are made loose by design, and can handle the varnish getting in the chamber better than one set up for brass. The first question out of a gunsmith’s mouth after a case stuck in the chamber – “have you been using commie ammo?” If you want to take a chance, go ahead. I learned the hard way.