Unless you hit the engine or the pilot. That's what got von Richthofen. One .303 British round through the heart.
You sure it wasn't Australian? The controversy has been long waged over whether it was a Canadian pilot (Capt Roy Brown) who was in pursuit of the Red Fokker Triplane or one of several Australian Anti-Aircraft machine gunners who all fired at the distinctive red aircraft. Granted the bullet was likely made in the UK so you could say it was "British" after all.