That was standard procedure in barrel making among at least the builders of the last half of the 19th century. There's more about that in Ned Roberts book on the caplock rifle. Some seem to think that shooting in a sharp barrel is fun that stops once the barrel is shot in. I firelap a rough barrel and then enjoy the following 200 to 300 shots even more. Now stand by for the dire warnings against fire lapping from those who have never done it.