Pedersoli did a double 12 it was my first half decent muzzleloader but i offloaded it as it was very light.
I now use a Navy arms double 12, its barrels are much better made than the pedersoli and it is noticeably heavier and can take heavy loads. it wears a fibreglass tent pole ramrod and is a good strong gun, plus i do not worry about getting it muddy or wet!