The shotshells of 1907 were paper formed hulls, felt or fiber wads, soft lead shot, and likely roll crimped rather than the pie shaped folded crimps of today's shells. Newer nitro based smokeless powders were in use but some people would still shoot black powder shells. The modern plastic hull and the one piece plastic wad with obturating skirt, shot cup, and plastic petals was not developed until after WWII -- basically the 1950s and early 1960s. That is one reason the old vintage guns and their chokes were so tight on these guns--- the inefficiency of the shotshells of their day and their failure to cushion and protect the soft lead shot in its trip up the bore. When soft round lead shot gets deformed or flattened it doesn't fly very "true."
The Germans and Austrians had a upland heritage of hunting for both fur and feather in the same outing or trip. Rabbits, foxes, etc. and grouse, pheasant, upland birds, and waterfowl. The same can be seen in their choice of hunting dogs--they bred and hunted over "versatile dogs" for this very reason-- the ability to hunt, track and retrieve fur bearing critters, uplands birds, and waterfowl. So they would breed and train their dogs for multiple quarry. I listened to a podcast recently on Continental / versatile hunting dog development that commented that German hunters were expected and even obliged to shoot foxes etc. that they encountered as a means of keeping these predator populations in check and saving domestic fowl like chickens and geese from excessive predation. Interesting hunting tradition. Another reason the Germans and Austrians gunmakers were so fond of making and using "combination" guns like shotgun- rifle combos and drillings (two shotgun barrels and a third rifled barrel in the same weapon.) The design, craftsmanship and engineering of such a weapon is amazing.
I suspect the aristocracy had "driven shoots" on large estates similar to the English aristocracy at least before WWI, but the burgeoning middle class of merchants, professionals, established tradesmen, etc. likely hunted in small parties or individually over dogs-- what would be called "walk up" shooting or "rough shooting" in England.
Check out these early 20th century postcards on the German Hunting Guns website.
http://www.germanhuntingguns.com/huntin ... ng-scenes/