What I find most interesting is how deep of a case depth you can achieve at the lower temp ranges. Something some so called "experts" say can not be done....
I wouldnt think there would be much disputing that higher temps and longer times could allow available carbon to migrate deeper into lower carbon steel. For gun finish, wouldnt the question be, is it necessary? I dont think the colors have been shown to be caused by the carbon, so would packing material intended create colors be affected by excessive heat and time.
It also could be that industrial case hardening of low carbon alloy steels benefit from much more precise controls and higher available carbon than inside of a char coal crucible. Id think short of taking multiple samples out of a gun part for analysis before color casing, experience in the art of it may come into play.
