Identify this cartridge...
 

I have my own thoughts, but I'm limited to slow internet for research...

Could start here
 

What are the Dimentions??

Outside diameter of the rim is 1.25", and the rim thickness (from the back surface to the first cut) is .110". I think its a Russian 20x115mm casing but I couldnt find any dimensions for that cartridge on the internet, and unfortunately there is no library where I'm at. The "77" on the headstamp looks to be a date - 1977, and the arrow is similar to the arrow stamps on Russian AK-47s from the Izhevsk factory.

Suggestion from Ammo Spec.
 

The round looks like the back of a cartrige for a 155 MM Howitzer round, or maybe it is foreign I am continuing to cross reference the round.

This is not a good start GrassHopper.

You received an email with directions to be followed.

You didn't...

Go back and read the message, follow the directions, then use the search function..

Failure to follow directions can be terminal...

Nuff Said???

1. Read the board stickies and rules, and comply before posting again.

2. With a stated head diameter of 1.25", and you think it is a 155mm case, that would be a neat trick.

3. Not seeing an 18 anything in your future after this start.

TR

Doesnt seem so in this case.

Well it's definitely the base of a cartidge, and I'm fairly certain that it's an anti-aircraft round. It makes sense considering where I found it too. It's way to big to be a 14.5mm ZSU cartridge and the closest Russian round I could find that matches the profile of the head and the rough dimensions is the 20x115mm.

My guess is its a AGS-30 casing

http://www.youtube.com/watch?gl=US&v=ulH7Kr-UQEU

or http://www.youtube.com/watch?v=KGg3j...eature=related

I'm with 7624U on this. A 1.25" would be about 30mm (25.4mm per inch). A very short case is a trait of a rifle grenade cartridge which are very low velocity. An AA cartridge would have a longer case for more powder/velocity.

CD

Agreed, it would be - but this casing was ruptured or cut by some means, this is only the head and maybe an inch of casing. The rest of it is whereabouts unknown.

Modified maybe?
 

We do the same thing you our spent 20mm and 30mm cases. Clean 'em, cut 'em, and lacquer 'em. End result, shot glass. :D

Perhaps this is one of the experimental and rare 30mm cartridges that used a short case and a very long (155mm) projectile.

MVP