I just took possession of a .43 berdan cartridge. How to I date it?

[MilsurpLovr]

It is stamped 5 1 8 p (n in cyrillic)

Any info would be great!

Information

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[CINDERS]

Was adopted by Russia in 1868 used in the Berdan 1 and Kmka 69 rifles, after 1871 it was used in the Berdan II rifle.
In the 50's & 60's a good No. of old Colt Berdan I's & II's rifles showed up in various surplus stores along with suitable BP ammunition, in the U.S it was known as the .43 Russian Berdan cartridge.
It was primarily a military cartridge and was not used to any great extent for sporting purposes.

It was also known as the 10.75mm x 58Rmm (Rimmed) Russian Berdan.
Date could be May 1918!

Source cartridges of the world 14th Ed Page 515

[LTPayton88]

Can you upload a picture of the head stamp and cartridge? I have a few original cartridges mostly from the 1880s though. These are a few from mine.

[MilsurpLovr]

I dated it and it comes from the St-Petersburg Cartridge factory and was made in the first quarter of 1885. My Russian skills were quite useful on this little research project hehe