I think crescent butts are great, in small caliber, soft recoiling rifles. And I think that is where they were always used. Big caliber American military guns had flat butts from the early 1800s. After the Civil War, Henry, Winchester, and the like made crescent butts, but these were quite weak rounds. Later, schuetzen had crescent butts. But when the 1874 long range Creedmore competition rifles were ordered for the famous match against the Irish, in hard kicking rounds, they were with "shotgun" butts.