I have 3 Boswell hammer guns. An early 2 5/8" 10, a really early 12 Jones underlever non-rebounder sn 2296, and a later more modern style ca 1900, 12 toplever, side-clip, pigeon gun sn 13172. Sadly the latter 2296 and 13172 are wall hangers (scary deep pits). The 10 gets out quite a bit.
Why do you ask?

Joe