I didn't turn up anything with a quick search, does anyone offer 50bmg case annealing as a service? My cases are on their third reload, probably time for it.
He cannot do 50 BMG. Starvingboy, have you ever tried annealing with a blow torch by hand? I do it that way, and you could probably just have 2 torches going at once to do the 50 cal pretty easily.