Over 20 years ago I bought a large number of these cases and formed them up for 458 WM, 375 H&H, 300 WM, .270, and .250 Savage. Some how I managed to let the Mag. steel heads out of my grasp. I have the brass formed in .300 WM and NO STAINLESS STEEL HEADS. If anyone out there has the steel head I would like to talk with you. I don't need many, but I have only got 1 head and 70+ never fired brass cases
This was an interesxting concept. I got some unreal volicitys out of those with the .300. Fun, but very expensive.