Hi,
I have a muzzleloader Westley Richards 8 bore damascus BBL ca. 1865, it was regularly used by the last owner on geese and ducks in Kent UK.
I also have an Elderkin Double BBL 8 bore that was originally a spanish Zabala 10G and polished out to 8 bore. Shoots quite softly with 3 inch shells and blue dot (remington industrials).