Good luck, Of all my many years of collecting brass I don't recall finding any 6mm Rem. If I did have a pile of range brass for that cartridge or I shoot and reload that cartridge, how good is it and how many times has it been loaded?
I have sold and shipped gun brass, depending on what it is I charge 2-3 times the local scrap value and add shippig.
I hope you get lucky and Santa comes through.