This round surfaced last week in an attack on a conservancy in Kenya. 7.62x39mm.
Absolutely stumped. Stamp looks like KDFS, which kinda sorta corresponds to KDF as in Kenya Defence Forces, but Kenya Ordnance Factory Corp headstamps KOF, produces brass cased ammo only as far as I’m aware, and absolutely doesn’t make x39. I cannot find any corresponding headstamp, or anything close, anywhere.