I know I have trust issues. I'm one of those
pious individuals who think my loaded ammo is better than factory. Actually my mindset is more "I did it, so if it's bad it's MY fault". But I do not trust mass produced factory ammo. Scores of dud .22 LR have reinforced this over the years. I know there are some external issues, such as storage, that influence.
This late instance indeed had some poor storage issues. I'm not really for sure where I acquired them, but I didn't buy them myself. The partial box of "cheap" Remington ammo had two rounds still loaded but sporting dented primers. Several rounds had external corrosion while a round next to it in the box was perfectly clean. Some corrosion had oxidized into green powdery spots. I cleaned that off with fine steel wool. Picking a "dud" round I unloaded it with a bullet puller. Only about 15 grs. of extruded stick powder came out. The bullet itself was green on the base with some granules adhered to the green goo. I dug some powder out of the case and it was clumpy as if wet. It did not smell fowl nor did I detect a nitro smell that should have been there.
I not sure the brass should be used. It's not pitted under the corrosion though. The tumbler might restore the brass cases. I will clean the projectiles and reuse them. Were it not for the obvious duds or external corrosion I might have trusted them for an important outing. I'm happy I discovered the issue.