Every six months (pistol quals) I shoot my defense loads and then load with fresh. Maybe a little excessive but it keeps me on a regular rotation AND I know its not too old.
Have you ever had any of them not fire? I'm betting not. And for the peanut gallery, a working LEO is putting them in and out of a far worse environment than most of the rest of us. From a warm patrol car into the cold and vice versa depending on the season and on a daily basis I might add.