I have considered those as well. Gun tolerances and so on. The key to the magic box is pressure equals velocity, and velocity is pressure. In a shell, that means Avery container of powder should come with a chronograph. And a box of brass should come with a C U P tester. We see lots of lists showing safe working pressures, but did you ever sit and really wonder? Kina Scary? And still I can’t wait to get to the range for some more testing. Another part of this question, is who can one recommend to make a closer tolerance cylinder for my girl, want to squeeze every ounce of potential out of my Redhawk… Also, Know any good chronographs out there….