Those were slow twist,,the Seneca and Cherokee in .45. Still using the 1:60 0r 1:66 twist in .45 for ball. Prior too and during the period after the fire,,,,,, The machine that made those barrels was destroyed. And they never re-tooled too make those barrels again.
Uuhhm,, it's easy enough to tell if it's 1-60"s twist,or,,,,1-48" twist,,really,,,,all it takes is the same as any gun for twist. a "cleaning" patch and a tape measure
