rfrankhauser,
As far as your question of how drillings are used is concerned,I guess the answer could be "all the above".I usually had a rimfire insert barrel (Einstecklauf-EL)is the right shot barrel, to take advantage of the set trigger. I usually used the drilling to hunt Reh(Roe)deer from a highseat.In this case,I mostly kept the scope mounted. I remember shooting a fox with the EL, from the highseat. When it was time to come down,from time to time ,I would shoot a hare for the kitchen, with the EL(hunting in the states I shot racoons,"tree rats", with EL).When hunting Reh with several friends, a few times we would make a "mini drive"while walking out of the woods,usually with the scope removed; but I do remember shooting a hare through the scope, with shot.If you were invited to a field drive hunt for small game,if a drilling was used,the scope would usually be left in the car and the barrels loaded with shot(rifle barrel usually not loaded, for safety).If the hunt was a woods drive for small game,pigs, and maybe minor red deer;the scope may be mounted or carried in the pocket.The barrels would be loaded with shot(not buckshot)slug, or bullet, at the option of the hunter.The loading would be changed and scope mounted/dismounted according to what was sighted by drivers/other hunters.I guess you could say drillings were traditionally used to meet the situation at hand.
Mike
