Since I started my life with guns, I’ve been told by instructors, fellow shooters, and everyone in between that you must cycle out your carry ammo every few months. It was explained to me that temperature shifts and moisture that your carry ammunition is subjected to will destabilize the ammo, compromising its reliability.
Last fall, Teen Bot dropped a Ruger 22/45 magazine at the farm that was loaded with ten rounds of CCI Quiet. This magazine remained lost until Jennifer found it under some grass that one of my cousins had recently mowed. The magazine was dirty and rusty. I had my son clean it up at home, and then on a whim I dusted off the ammo that had come out of it, and loaded those same ten rounds back into the magazine. I really expected failures. Here’s the video:
Please do not in any way take this as advice to not change out your ammo. I am still a firm believer in keeping your carry ammo fresh. However, it makes me question the popular wisdom that you can’t get your ammo wet, and it will go bad if subjected to temperature swings. It was my understanding that centerfire ammunition is quite a bit more durable than rimfire. If this is the case, that 22/45 magazine has me questioning the reality of carry ammunition durability.