[486] question, weird 30-06 steel cases

[M92PV4U]

All I see are those strange steel 30-06 cases that got the cannelure above the case head.

what the fuck is up with those why do they exist
I remembered seeing them for sale, but they just make no sense

Barnaul Introduces .30-06 Springfield Ammunition With Peculiar Feature​

Giorgio O
3 years ago

Barnaul Introduces .30-06 Springfield Ammunition With Peculiar Feature. Here with 168 gr FMJ-BT bullet.
Barnaul recently released a new, reasonably priced, steel-cased .30-06 Springfield load with a “mysterious” feature. It is probably already pretty obvious from the title image, but let’s first see what the company says about it.
Here below the full press release:

Russian Big Game Ammunition Question
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MKS Supply, Inc., Dayton, OH – November 2019– MKS Supply–the answer to the mysterious cartridge groove.

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.

Note relief ring just above cartridge base.

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.

While this is definitely an interesting solution with a certain degree of elegance in its simplicity, it is not entirely unique, although uniquely Russian. Attentive readers surely remember seeing a similar pressure relief ring applied to the Russian 6x49mm Unified. Unfortunately, we’ll never see that caliber on the shelves, but it’s quite cool to see its characteristic groove adopted in a standard caliber.

Barnaul Introduces .30-06 Springfield Ammunition With Peculiar Feature. 168 gr Soft Point rounds.
Find .30-06 Springfield Ammunition
Back to Barnaul offering, MKS Supply does not explicitly release a price, but the Barnaul Ammo website links to an online shop selling 20 rounds boxes of 168 grain FMJ-BT at $0.69 / round and 168 gr SP – BT at $0.52 / round.

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Giorgio O​

Italian firearm enthusiast now living in an even more restrictive country, Giorgio has a passion for innovative or plainly unusual mechanical solutions. He’s also interested in manufacturing technologies with a recent focus on additive manufacturing.
You can contact him at giorgio_o at zoho dot com and you’ll find him in the comments section as Giolli Joker.

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Categories: Ammunition, Press Releases
Tags: .30-06 Springfield, Barnaul, steel case

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[Pony_Driver]

Thanks for posting that. I wondered why it was there but wasn't going to look it up.

 

[87manche]

so I can put russian steel case in my garand?

if she ain't eat steel she don't deserve brass gobbles.

 

[[486]]

neat
it's much older than 3 years

sorta a.... bellows in the case walls to help prevent case head failure

GIF of chamber/cartridge dynamics in a typical brass rifle case:

 

[bdkw1]

neat
it's much older than 3 years

sorta a.... bellows in the case walls to help prevent case head failure

GIF of chamber/cartridge dynamics in a typical brass rifle case:

And the groove is right where the highest stress is. Neat!

 

[Roc Doc]

Russian plot to blow up our Garands.

 

[[486]]

And the groove is right where the highest stress is. Neat!

the case walls adhere to the chamber walls under pressure
before firing, the case is set to the front of the chamber from the firing pin strike, or a plunger ejector or whatever
the case stretches wherever it will to eat up the headspace

this is why neck sized cases don't stretch as much, the headspace clearance is removed from the equation

Learned about all this crap when I was thinking on making a case-deformation-delayed blowback, cut a ring in the chamber and it'll slow the bolt velocity somewhat at the extreme expense of case life. It only works on lower pressure rounds for the very same reason that roller delayed guns need a fluted chamber or lubricated ammo.