Jack, it couldn't be any simpler, just run a 30-30 (lubed) into your full length 7 X 30 dies. Viola, a 7X30 case appears with a smaller neck and small shoulder. Chamfer and load any normal 7X30 load to fire form. The brass blows out to fully form the case, you can hardly see the old 30-30 shoulder. The same process also works on 32 win special cases.