I don't understand why your ammunition is bad after only 10 years. To be quite honest with you, I sometimes shoot from the back edge of my property into the farmer fields. It's not uncommon to find a few unspent 22 Short, 22 LR or 22 magnum cartridges along that line. Some of these have been through many winters and rainstorms, exposed to every bad thing mother nature could give, including direct sunlight. Heck, I've probably run them over with the mower too. I've picked up a few, wiped clean, inspected for damage, then loaded, just for kicks. Every one of them fired so far.