I was casting 180 lee .30 cal bullets the other day. I did it in two sessions, the first I ram the temp hotter and at a quick pace. The other was cooler and a but slower. The weigh variance between bullets in each group ran 1 grain but the variance between the 2 groups was 3 grains. The first ran 178.9 to 179.9 the second was 176 to 178. how could this be?
thanks Nick