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Weird Russian .30-06 ammo
Posted: Tue, 12 Oct 2010 13:19:49
by Jim
The link below will take you to an ad for Russian made .30-06 ammo. Click "Enlarge photo" and look at the weird groove in the case just above the base. What's up with that?
http://www.cheaperthandirt.com/AMM678-1.html
Re: Weird Russian .30-06 ammo
Posted: Tue, 12 Oct 2010 14:01:46
by gunderwood
Kind of looks like a belt almost, but if you read the details it points out that it is a brass coated steel case. That groove probably was added to provide some expansion room since brass and steel will not expand at the same rates. That however is a guess as to why they did it and it seems reasonable it has something to do with the metallurgical properties of the two metals being different.
Re: Weird Russian .30-06 ammo
Posted: Tue, 12 Oct 2010 17:56:09
by Jim
gunderwood wrote:Kind of looks like a belt almost, but if you read the details it points out that it is a brass coated steel case. That groove probably was added to provide some expansion room since brass and steel will not expand at the same rates. That however is a guess as to why they did it and it seems reasonable it has something to do with the metallurgical properties of the two metals being different.
Good guess, G. I have no clue what it's for.
Re: Weird Russian .30-06 ammo
Posted: Wed, 13 Oct 2010 07:13:52
by zephyp
I would be crious that if you compared the diameter of the part immediately forward of that groove to a "normal" case that you find a slight difference. And, would you also find a difference in the case thicknesses if you compared the "belt" areas. Perhaps when they designed the cartridge they had issues of head separation...just a guess...