[eli]

All Russian .30'06 has this band towards the case head, much like much larger cartridges do (25mm Bushmaster and so)

What is it and why is it there???

 

[Devil Dog]

It's the method they use to prevent the steel case from sticking in the chamber. Can't exactly tell you how or why this works though. The groove you see on the 25mm round for the Bushmaster is to align the case in the link. Two totally different applications here. I 've seen these fired Russian .30-06 cases and sometimes the groove is completely unchanged and sometimes it is "fireformed" to the dimensions of a regular .30-06 case, sometimes somewhere inbetween too...

DD

 

[AZshooter]

Looks to be faulty workmanship, since there's no special magic needed to produce a case of that length with smooth wall dimensions. Looks to be a brass case, negating the need of some kind of special doodles to make a steel case work. Regardless of the excuse, it sounds suspicious to me.

Why not go to your ammo mfgr's website and ask them directly?

If it were a product I made and wasn't supposed to be like that, I'd want it back in a hurry.

 

[Shoobedoo]

Steel case with a brass coating. Apparently the ring is to aid expansion. Nothing suspicious here.

More info here, scroll down a bit and read the product info tab:


http://www.midwayusa.com/product/55...+Rifle+-+Blasting-_-PriceCompListing-_-558507


I've never shot any of this stuff, but there's no reason to believe it's faulty or dangerous as far as I can tell.

 

[Devil Dog]

A friend bought some of this ammunition, but of the older, lacquered steel case variety. It did not seem to be loaded with a powder that was compatible for use in an M-1 Garand. It felt and sounded very hot and gave a great big fireball at the muzzle...

The ring is odd, and plenty of other countries have manufacturerd steel cased .30-06 and other full sized rifle calibers without it, but this is what the Russians decided to do. I've seen pics of another caliber where they used this same ring around the case head. It was an experimental round in the 6mm range as I recall.

DD

 

[eli]

I'm sure it's not faulty and I fact quite deliberate. I've only seen it on the 3006 regardless of lacquered or brass coated.

I can see it being to aid extraction, but agree that I don't see how. And if it was designed with a weapon in mind, which?

This is like the recess in the bolt face of the AK-74 type of weapons where a fired primer nipples on purpose... but what purpose?

 

[Ray Meketa]

To help prevent case head seperations. The "ring" will flatten out, allowing the case head to move to the rear. You can find some cases with more than one ring (not necessarily Russian).

Ray

 

[Shoobedoo]

To help prevent case head seperations. The "ring" will flatten out, allowing the case head to move to the rear.

I think Ray nailed it here. The stretching and expanding charachteristics of smaller and shorter steel cases like .308, 7.62x39, 5.45x39, .223 etc. are apparently much different than the long .30-06 case, and that's why you don't see this "expando" ring on any of the other common calibers of Russian steel cased ammo. The makers of this ammo no doubt found this to be the best solution for safety in a wide variety of rifles.

 

[eli]

So does that mean the OAL of the case is significantly different before and after firing? Also, is this a semi auto enhancing design or no implication?

 

[dmac]

I put a hundred rounds of this stuff through my Garand yesterday and had no problems whatsoever.

 

[Ray Meketa]

New cases should be within CIP or SAAMI specs. After firing they could be longer depending on how much they stretch which is determined by the headspace of the rifle. No different than any other ammo.

Ray

 

[eli]

Thank you all for the input, specially you Ray

 

[Franz 1796]

Why no 'expando ring' on 54R then?

 

[storkman]

I will venture a guess, rimmed cases headspace on the rim, end not the neck. (??)