Rick is speaking about tools and technique that isn't mentioned in any of the Corbin Handbooks ( I think), and is worth considering in certain circumstances. For instance, even a hydraulic press has difficulties extruding wire from a 'standard' wire making system to make any diameters below .185". I have one of the dies that Rick speaks of that fits in my CSP-II press where I take .360" wire, cut it into 1" lengths, and then extrude it so that it fits my .17 cal jackets. Each length made this way is long enough for 2 or 3 jackets. Of course, if you don't have .360 wire you can use cast .360 cores. I believe the price of this die is about the same as a LSWC die. I'm not a technical person, but I believe there are limits as to just how much one of these simple extrusion dies can downsize lead wire from a given parrent wire (core) size. I'm not sure, but the Corbins may even make these dies to fit a reloading press. Anyway, this is a 3rd option to make your cores.