I recently picked up a 16ga rolling block. Neat looking gun, rifled 34" barrel, rifle sight. It appears to be straight rifled but was told that there is actually a slight twist in the last 8 or so inches so possibly 1/100.
I'm curious to find out what type of load was fired in this gun. My guess is round ball but the groove diameter goes upward of .685.
Any Sweeds out there with firsthand knowledge?

Cheers.
Tom