Garden ammo?

[boscru]

...it was shiny going in...

now that's funny.

 

[mac1911]

Any local history in the area? Business,manufacturing? How about local historian? I would rent a,nice metal detector and sweep the area. Might find more cool stuff.

 

[spcantwell]

Classic application for "google image search" - "antique plumb bobs" turns up LOTS of pictures of peoples' collections.
While it does not match your example, I thought the one on the right was compelling!

Lol I want that last one... I don't think my company will like me using it though...

 

[wegman]

Sash weight?

 

[CTpatriot]

keep digging deeper, MGs are next.

 

[mac1911]

So there's no "what's this app?" Would be cool just put object into view and bingo .....you got xxx

 

[Dradian]

Going to try electrolysis...let's see what happens

Sent from my SM-G935P using Tapatalk

 

[speedy]

Hit the back to see if does anything.

 

[fbirdquik6]

Throw it in the tumbler!

 

[Dradian]

I think the electrolysis was a sucess. It definitely has the shape of a 20x138mm, but it is entirely made of steel.

Someone put a screw into the primer pocket. Maybe they used it as a plumbob as some have suggested.

My best guess by shape and google is a "German Inert WW2 20mm Flak DUMMY Round"
https://www.libertytreecollectors.com/productcart/pc/viewPrd.asp?idproduct=4254

Or a German Inert WW2 20mm Flak API-T Round
https://www.libertytreecollectors.com/productcart/pc/viewPrd.asp?idproduct=4252&idcategory=71

 

[EvilDragon]

Dummy round plumbob sounds about right.

 

[Gibbs]

I am voting this "Best NES Detective Thread of 2016"

 

[Skysoldier]

I think it is just a very old sash weight.

 

[NTMAREMACH]

This is a German 20x138B Rheinmetall "Dichtungspatrone" of the navy for use in submarines. A chamber plug for guns installed on submarines. These were heavily greased and then inserted into the chamber of the gun and remained there as long as the weapon was not used and in particular when submerged. These "plugs" were supposed to prevent corrosion of the chamber and sowith a rough (corroded) surface of the same. Otherwise cases would not be extracted properly during firing or might even been torn apart while in the chamber. All that during an air attack on a emerged submarine whould result in a catastropy.

These "plugs" existed also in 30x211 MK303 and in 37x250R C/36.

Above info is from a Google search and is just a guess.

 

[Dradian]

This is a German 20x138B Rheinmetall "Dichtungspatrone" of the navy for use in submarines. A chamber plug for guns installed on submarines. These were heavily greased and then inserted into the chamber of the gun and remained there as long as the weapon was not used and in particular when submerged. These "plugs" were supposed to prevent corrosion of the chamber and sowith a rough (corroded) surface of the same. Otherwise cases would not be extracted properly during firing or might even been torn apart while in the chamber. All that during an air attack on a emerged submarine whould result in a catastropy.

These "plugs" existed also in 30x211 MK303 and in 37x250R C/36.

Above info is from a Google search and is just a guess.

Seems to be the best explanation so far!

Sent from my SM-G935P using Tapatalk

 

[LoginName]

This is a German 20x138B Rheinmetall "Dichtungspatrone" of the navy for use in submarines. A chamber plug for guns installed on submarines. These were heavily greased and then inserted into the chamber of the gun and remained there as long as the weapon was not used and in particular when submerged. These "plugs" were supposed to prevent corrosion of the chamber and sowith a rough (corroded) surface of the same. Otherwise cases would not be extracted properly during firing or might even been torn apart while in the chamber. All that during an air attack on a emerged submarine whould result in a catastropy.

These "plugs" existed also in 30x211 MK303 and in 37x250R C/36.

Above info is from a Google search and is just a guess.

OP should rent a backhoe... there could be a whole damn U-boat buried in his backyard