Does anyone happen to know what type of steel "The Perfessor" used to make his Lyman / RCBS lubricator sizer die blanks from? I have 6 of his blank dies that have 3/16" pilot holes pre-drilled that I bought from him several years ago and we need to know what type of steel he used so that we know how to go about hardening them after they are bored out to the custom sizer die diameters that I need. If anyone has any information on what steel he might have used I would very much like to hear from you!