What is the difference between driven and walked-up grouse shooting? In driven grouse shooting, a line of beaters pushes wild grouse forward over stationary Guns waiting in butts; in walked-up shooting, the Guns themselves walk the moor in a line and shoot birds as they are flushed ahead of them. It is the oldest way of shooting grouse and, for many, the most beautiful: the sight of a pointer stopping mid-stride on a wind-blown scent is half the day. What do beaters and pickers-up do on a grouse moor? What does the horn mean on a grouse drive?