✅ SOLVED Bullet, hopefully old

[ted12]

I forgot to clarify the country I live in pistols are illegal and only hunting rifles and shotguns are allowed under licence, the area I checked has a very low chance for having an illegal gun the bullet is 9mm 15mm in height bullet tip
I believe to be copper lined with maybe lead inside as it is heavy, however I’m far from an expert so that could be wrong
Found by ruins of old castle dating back to around mid 1700s and don’t know when it was burnt down or abandoned

 

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[ted12]

There are at least 15 different cartridges using conical jacketed bullets of 9mm (.355") diameter, or within 1/1000" or 2/1000" of .355" diameter. Almost all of them can be eliminated as extremely unlikely to have ever been used where you found your bullet. The only one likely to have been in your country is the 9x21 Luger. It was used by Germany in both World Wars and many pistols (and much ammunition) were brought home by returning soldiers. Ones brought home after WWI were commomly pressed into service in the War for independance and the Civil War. The M1935 Browning pistol and the Sterlings and Sten guns used by the British army during and after WWII also used the 9x21 cartridge. Ireland was awash with 9x21 ammunition from 1916 to the time of The Troubles and it wouldn't be surprising if there is still more squirreled away than you might suspect.

Thanks you that really helps with figuring out where it came from and why it was here

 

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[LandSeig]

I would imagine that a FMJ 9mm isn’t as uncommon as you think in your country, it could be from military or police as it’s standard issue just about anywhere in the world for quite a while. There looks to be very faint rifling marks on it in the first pics, so it could have been fired several miles away. Also could be an illegal one, probably not that uncommon there either.