Smokeless powder breaks down over time, that is a fact that much chemistry has been invested in over he last 100 years. The volume of the smokeless powder obviously has a great influence on how fast the chemical process goes and how much energy is given off from the process. Ammunition fires are rare now and the chemistry behind the process well understood and a program for analyzing how much stabilizer is left in the powder has been running for many years.
almc.army.mil/alog/issues/Ju … ab_eq.html
In the above linked article they mention the fact that old small arms ammo can be unstable when pulled apart.
But un-pulled SA ammo have not been the cause of any fires or has it?
Do we know about any normally stored collections that has been the cause of a fire?
(I think I have asked this question before, but can’t find the relevant post…)