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Whats happend with these shells?

M

munfrosch

Well-Known Member
Premium Member
The right is a normal fired shell but the other 2? Whats this?
 

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Maybe not fired twice, but pushed twice thru barrel for technical test reasons?
 
i dont know it :tinysmile_cry_t: i get them with eod scrap from a proving ground some years ago
 
Maybe from a barrel-wear out test? To find out how many shots a barrel can have before it is becomming inaccurate because it's worn out. After all; they are proving ground scrap.

Regards, DJH
 
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Could it be same caliber, different make gun??
John
 
yes an inproved gun with other barrel or barrel lifetime test would be the possiblest i think
 
Or maybe pressure testing?
The middle one looks like most 20mm and 30mm fired shells i have,the driving band seems to slew over into the next groove.
The last one almost looks too neat!

Bob
 
To fire a round twice? I am not sure.

To test another type of rifling, easier cheaper or faster to manufacture and then proving the barrel wear and precision with already manufactured ammo, that is my humble theory.

Maybe there exists some writen proof in the archives.

Bob
 
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