Unusual head stamp

NJM15

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At the range trying the srp in my 9mm handgun I found this, I know its a 9mm cartridge but I have never seen one that didn't say 9mm Luger, this one has MFS 9x19 sorry for the lousy pic

 
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That is made in Hungary.
Sometimes you will see only the manufacturer and year, nothing to do with caliber. There are no hard and fast rules in this business as to headstamps. Sometimes there are designer headstamps that can say practically anything!
 
9x19 is the European/NATO designation for what we call 9mm Luger. that same exact case was used by Beretta and other Italian firms around WWI for a loading called 9mm Glinseti (sp), it was a much milder round and the Luger rounds would damage those pistols. Some 9mm rounds are 9x17 aka .380 ACP or 9mm short. 9x21 had a number of different loadings in the same case , The Spanish called it Largo and the Austrians called it Styre and loaded it much much hotter, and the American version had a semi-rim and we called it 38 Automatic (not to be confused with the very hot 38 Super+P). The 38 Automatic will fit and can be shot in many of the Spanish 9 Largo pistols, like the Star Super B, but won't chamber in the Astra 400 due to semi-rim. There were/are a few 9x23 and even longer loadings for American made pistols 9 mm, Winchester Mag falls into this category. There is an old 9 mm Browning/ Mauser round loaded in C-96 broom-handles and a rare Browning, but I forget which length it is/was. Headstamps can be confusing, they don't all say the same information. Usually they say who made it and when, sometimes what size round it is, and NATO has their little + inside a O to prove it meets their specks. Have fun. Ivan
 
And the little + inside an O doesn't necessarily mean they are NATO rounds. Winchester sometimes uses brass with the WCC, year, and NATO +/O on the headstamp for plain white box ammo. Why? because the brass happens to be available.

And Lake City puts out 5.56mm M193 55FMJBT ammo with the NATO bullseye on it. M193 was never adopted by NATO. Why do they do it? Because they use the same brass they use for M855 62gr. ammo which HAS been adopted by NATO.

Confusing, but also fun.
 

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