An update, I have worked out the forming process and I have test fired 10 or so rounds, not bad for 2 years. Rounded up 375 H&H die and shortened it to start the necking down, then into 35 Rem with a locking ring to raise it up some, a 8x57 trim die to neck more and cut extra length off and 303FL then trim & chamfer, then on to neck turning. It has test fired fine, I have found PRIVI brass that measures better than US stuff, I had some HXP that was the same size as US stuff, but found 50 primed HXP cases that were about .455" that I'll try out. I like the thicker rim on the 405 brass, can make up for sloppy headspace.