From what I can tell from the N.R.A.'s book on cast bullets, quick quenching encourages "small" antimony dentrites that yield higher Rockwell hardnesses than the "larger" dentrites that slower cooling yields. Hardness after casting/heat treating can increase for a time and then gradually soften again.
Thanks, that sounds logical. However, I wonder how "fast" and "slow" cooling vary between shot size pieces of lead alloy and bullet size. Seems to me that the time factor for dendrite growth would be the same but cooling rate would be very diferent.
Good topic and discussion!!
DDA
