I know this is the reloading equipment page, but I hope someone can help me out here with a conversion problem. I am converting 30-30 to .225 Winchester. I have a very well known and respected book on the subject of Case Conversion. The procedure starts with annealing the brass, then running the brass through the .225 deprime/sizer die with the decapping rod removed. Well, this is all fine and dandy, but the problem is when you start to run the case in, the top of the case is not reduced in size and won't enter the neck size part of the die, so it just starts to crumple the neck the of the case. I did some research on the internet and I saw where some people run the brass through a .219 zipper die first to reduce the neck more subtly. Well, lo and behold this doesn't work either, same problem as with the .225 die, the top of the case doesn't fit through the die and it starts to crumple the case. Does anyone have any suggestions on reducing the diameter of the 30-30 top so it will fit in the .225 or .219 zipper die? Or is there another caliber of brass that could be converted to .225?