Pat
I have quite a bit of brass from Red Cornelison. He tried just about every combination you could think of using the 222, 223 and 222M brass. He also experimented with Step-Neck Cases, Rebated Rims, Tight Necks, Loose Necks, Long Necks, Short Necks, you name it, Red tried it. He also shot a 308/6mm before the 243W came out. He was an avid wildcatter. I believe Mike Bryant still has some of his reamers and Butch Lambert has a lot of the cartridges.
Ray