Sort of sliding away from the topic, but the old, standard, drop back 10% whenever making a change of any sort, from a different powder lot to having your hair cut, always seemed excessive to me. I am not advocating blowing up any firearms (in earlier years and for some individuals termed "experimenting"), but dropping from 57.0 grains of H4350 with a 180 grain bullet in an '06 to 51.3 always seemed a bit extreme.
