I have a die set here for the 6BR .100 Short. The seater is of the inline style with a aluminum base and aluminum cap that has some numbers on top like a generic micrometer top.
The resize die is converted from a Redding 6BR body die into a bushing die with an aluminum plug retaining the bushing and a Redding decapping assembly is threaded into it.
I found the initials JLC stamped into the aluminum on the resize die.
Is this the work of Jim Carstensen?