Jay, the greatest risk with rusted ammo is damage to the chamber and stress on the ejectors, extractor. As the base metal expands, it forces the rust paticles into the pores of the chambers. At first they may look fine, but with time, that trace rust will grow, rusting and pitting the chamber. The majority of repairs I do on extractors are due to corroded or poor quality ammo. I have a 311 that I use up bad rounds in. I would never fire any compromised cartridges in any of my fine doubles, rust is the bain of quality steel. I would allways reccomend using only the best quality rounds, in new condition.
Brad
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