I am new to this forum. Have been casting for 30+ yrs. Just noticed that some of my Lyman molds have suffixes after the numbers. For instance: 429421CM--410459A--and some with U's . I know the u is for undersize molds but have no idea what the others mean. Maybe some of you can enlighten me. There must be a chart or some reference that you guys can tell me about. Any help would be appreciated. Thanks ---dale