Anyone have a clue what kind of time it would take for an environment to have some adverse effect on ammo? I ask because I inadvertantly left some match 7.62 M118 ammo in the garage for about 3 months. The temperature range was probably 85 degrees F down to about freezing. Prior to that it was in my cool dry basement and therefore safe. Would there be an negative effect on accuracy or velocity on this stuff? Your opinions?

Extremely high heat would have had the most effect on it in the short term. It has probably not been effected at all.