The lifespan of ammunition can vary depending on several factors, including the type of ammunition, storage conditions, and how well it has been maintained. In general, most ammunition is considered to have a shelf life of 10 to 15 years when stored properly in a cool, dry, and secure location. However, it's important to note that ammunition can potentially last much longer than this if it has been stored in optimal conditions and has not been subjected to damage or extreme temperatures. Conversely, poorly stored ammunition or ammunition that has been exposed to moisture, extreme heat or cold, or other damaging conditions may have a shorter lifespan and could potentially be unsafe to use. It's always important to inspect your ammunition regularly and discard any that show signs of damage, such as corrosion or deformation. Additionally, it's recommended to rotate your ammunition periodically and use the oldest ammunition first to ensure that your stock remains fresh and reliable.