I bought my 30-378 brass from Weatherby, so I didn't have to do anything but clean it up.
My 30-378 dies are RCBS.
Thank you for the input. Thats a bummer, in theory it seemed like a good idea. If there is a (good) way to do this while I wait for my Redding dies, other than the 30-378 dies, I'm all ears.
To hunt... or not to hunt...? What a stupid question.