Can be found on Nuka-Town USA raiders and commonly carry the 'bladed bull barrel' version.One can be found on a table inside the vault section of Bradberton's office on the table with a kickball and a book.The nearest access point to the highway is an elevator, south of Sunshine Tidings co-op.
44 pistols may be found on some of the bodies of raiders in and around Dunwich Borers. 44 pistol may be found in an open safe in the upstairs rooms of the National Guard barracks. 44 pistol might be found inside a drawer in the Federal Surveillance Center K-21B in the south part of the map. 44 pistol may be found in Hardware Town on a table with a box and wine bottle in a room upstairs.
Follow the pump pipe, it leads directly to the skeleton with the gun. Cross the bridge leaving Sanctuary then follow the shore left, past a dock until arriving at the water pump. The skeleton is leaning against a deactivated water pump not far from an unmarked small raider camp.