I can't say what they had in mind but it looks by reading the list that its single shot breech loading rifles designed before 1900 which all the listed ones are. The exposed hammer thing must leave out the Rugers. I wish they would do that where I hunt. However If its a black powder season then only black powder should be used. Some states call it a black powder season, some call it a primitive season and others call it a muzzzle loader season which should allow any rifle that loads from the muzzles regardless of powder type.