I don't know where this photo came from but here it is. Good ol' Lee Enfield and no, that is not me. I'm more grey haired.
Notice the barrel doesn't look original. It's probably a 6mm Musgrave (6mm 303), given the barrel profile and the fact that one can't get close to baboons. Unless that's a tame one and didn't start out at the other end of the rifle.