I’ve lived on the Texas coast for many years, kept my powder in a garage, both insulated and uninsulated. It gets hot in the summer and cold in the winter. Never had a primer or powder issue.
Will do just fine in an out building as long as it’s dry and in a closed cabinet.
People still have drums of surplus powder that have survived many many years of hot and cold. Just got to keep,it dry.
Last edited by GringoCazador; 04/25/21.
