Bailey, aside from the grain refinement, in general what other heat treat would you consider on such low carbon steels. I wonder if tin might contaminate a forge weld. Do you think maybe scale could be removed chemically by some acid and then weld the coil and core in a can, section of pipe. Only curious is all, fun stuff.
I can recall past topic discussions that I believe Bill F. welded the core in rather than remove it because he couldn't get any machine shop to clean up the rough hole, but a solid core could be deep hole drilled. On a thin shotgun barrel, the entire core would be removed, but it acted like a solid bar for machining. I believe he used modern barrel lining techniques with acraglass when he did those barrel projects with Bowen for higher pressure cartridges.
