Any idea what this is?

We found this in our garage in the uk any ideas what it is

Not my area of knowledge.
It might be a 30 x 170 KCB. Possibly a TP (Tracer Practice) loading, and maybe still live. If you have any doubt, report it to the police.

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35 x 228mm Oerlikon
Fired primer.

Headstamp markings-

BM: British Manufacturing And Research Company.
OE: Oerlikon.
18: Batch number.
84: 1984 year of manufacture.

From 1971 to May 1988, British Manufacturing and Research Company Limited (BMARC) was the UK-based ordnance and ammunition manufacturing subsidiary of Oerlikon of Switzerland.

Nice headstamp.


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