If you use the Hor-StoneyPoint system to find OAL and headspace and want to use your fired case to make mod. cases Enco tool(Enco.com) has the correct drill and tap and they have no shiping cost till 2-17-12. The drill is not the problem but the tap is hard to find. The drill is 7.3mm #303-1968 page #10 in catalog @ $2.23. The tap is a 5/16-36 #891-4932 page 89 @ $14.32. If you order you must enter promo code FSFR. I put the case in a impact bullet puller then put the puller into a vice to drill and tap. If you try hold the case in your hand it will most likely end up GIDDYWAMPUS.