Some powders will degrade over time. Some older ammunition have corrosive primers. Having said that, the CMP is still selling surplus 30-06 ammunition. It is still safe to shoot that ammunition and can be seen being shot by local CMP clubs.

So, the question is....Who made your ammunition? What caliber is it? What condition are the cartridges in (cases clean, corroded and green)?

Of course, do not throw the cartridges in the furnace!!!!