Looks like an Enfield .380" MkII bullet.
Michael, welcome here.
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Cheers mate. This one is killing me! I found quite a few of them in a ww2 British training trench. I haven’t been able to find a photo of this bullet anywhere! With the 2 groves.
Michael, could you tell the exact diameter (measured with caliper) and the exact weight?
The two groove bullet was standard for the British made .380" MkII until 1963 when the lower groove was omitted. Canadian production only had the crimping groove.