Hi Kevin, Weighed ten unprepped, unfired, picked at random out of 100. High = 160.8, Low =160.2 Avg = 160.4 Grains. Throwing out the 160.8 the rest would only vary 4/10th grain. This was weighed on U.S. Air Farce, Stratotragic air command scale. RCBS 10-10 :D