That holds true for old Central European guns from places like Thuringia. As our Slovenian friend pointed out many also had sling & swivels. By the time Rollo mounted gun from slung position the birdie was far away with its anus toward poor Ole' Nimrod thus the full and extra full combos often seen were sadly needed.
It is not uncommon to see old American guns with long barrels with no choke or little choke. Those were ball and shotty specials so beloved in South-Eastern US.
With slug in one and SG in other that is quite a slayer he has there.