Good timing on this. I was about to pack things in for the night.
Corbin has a jacket making die that's designed for 22 mag cases. I got these cases for nothing and wouldn't have bothered had they not been made of the std brass. I was hoping that someone had done this before me and had a recomendation for a weight. The process will be the same as for the 22LR cases.
I'll likely make something in the 100 grain range. Buying a jacket making die for $130 is cheaper (and more fun) than buying 4,000 6mm jackets. I'm looking at a little over $30 a thousand for them. Can't beat that!