Same here for all. Ruined a pound of powder. First started reloading, ruined a bunch of brass with hydralic dents with too much lube. And of course stuck a case or two in a die. Locked up brass in a 300RUM because I shot TBBC and used matchking data. Then to compound it, I dropped all loaded rounds before marking, and tryed weighing but the deviation of the brass was more than the max and min loads.

but the worse one of all. Using a Lee 1000 loader, ran out of powder and loaded up a few 357sig rounds with no or little powder. Went to the range and remembered to watch for it. But a buddy shooting with me didn't know, chambered the round, shot, and it ran in the barrel about 1/4". Thanks goodness it blocked loading another round by mm's. If not could have been bad.