My ex-B-I-L carried a High Standard 22 mag derringer often for several years. His carry reload was two loose rounds of Federal ammo after 8 or 9 times of going through the wash they were undependable! He took two rounds and used clear fingernail polish on the case mouth. Then put them in a sock and ran them through 20 loads of laundry over a few weeks. They worked!
Ivan
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