Consistency???

Is consistency too much to ask? Since 2008, H&N has made the .22, Baracuda Green with head diameters ranging from 5.50 - 5.54, in 12.50, 12.65, 12.35 and 12.96 grains. The first run of 12.65gr with a head diameter of .50-.51, worked best with my TX200, but I have no reason to believe that they will be comming back. Why are head diameter and weight always changing?