I PC'd, sized and weight seiparated 9-122gr TC bullets today. The lot of bullets was cast with equal amounts from different ingots to standardize the hardness and the lead was stirred. The volume of lead was kept high but I didn't use a thermometer. The bullets grouped from 124gr/126gr/128gr, 129gr, and 131gr. with the bell curve mostly at the 126 and 128gr weight and tapering off at 124gr and 131gr. I culled out maybe 10% of my bullets with exposed lead from the resizing. Any answers as to why there is such a wide weight variation? Heat?