an inch to inch and a half in a bread loaf pan is about 12 - 16 lbs. And I only use those for bulk storage of raw ingredients I am going to melt into big pot of some alloy. WW's, soft lead, even some printers alloys go into ingots I can feed into a pot. Just too much effort to move heavier than 16# ingots except as ingredients in 100# batch that will get poured into smaller ingots for actual casting. My favorite ingot molds for ready to use alloys are the angle iron ones like DCrockett sells or the muffin tin "pucks".