We nitride objects that need wear resistance by an outfit out of Edmonton. The case depth is anywhere from 0.005 to 0.020" thick. Nitriding does three things - it significantly increases wear resistance, improves fatigue and reduces corrosion. Win, win, win. This would greatly extend the life of the barrel, reduce throat erosion and would be especially advantageous to competitive shooters or overbore cartridges. If you wanted to be extra cautious you could just liquid nitride the bore where stress is lowest. (note we are not talking contact stress here)
Talk to the specialists to determine what type of nitriding would best suite a rifle barrel and tell them your application.
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