Bill, Jim, and Pete, Thanks for the info and especially for the link to Oscar Gaddys' article on the subject. I should have the second part of the article as I recently bought a large pile of Double Gun Journals, but obviously have not read but a fraction of them. Sad part is that I retired last July and now find that the heat treat oven in our shop was capable of reaching case hardening temps. Hell, maybe I could've used bones from the chickens we cooked in that oven to produce my own bone charcoal.