Came into a few thousand rounds of .22 LR . It was just put in a cardboard box and left on a shelf for 20-30 years. Looks to be from the 80s compared to the price tags on some of it. No rust, any that had any corrosion I threw out, the ones I kept are just kinda nasty. would like to clean it up to shoot without having to individually clean each round. I have a tumbler, but also not to sure about live ammo in a tumbler, red flags popping up in my head on that, but I’ve never needed to clean up Ammo before, any help appreciated!!