Ain't that the truth. Had some black powder 45-70 rounds I wanted to disassemble, clean and display with my trap door Springfield. Soaked about 30 rounds in water for 2 weeks, pulled the bullets (with an impact puller !)started digging out the rock hard black powder, decided to soak again for a week in a pan full of penetrating oil. Dug out the remaining powder, tumbled the brass in media for a few hours. Loaded the empty but still primed cases in the Springfield, squeezed the trigger and POP !