Why do people say to rotate carry ammo?

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After shooting rifles, shotguns and handguns for 50 years now, I don't see any real reason to change out carry ammo. I know all the current arguments, and they have merit. I do change my carry ammo, and use that older stuff for practice. Like it was said, it costs nothing really to keep fresh ammo in the gun. If I were to forget though, I don't think I would be worried one tiny scintilla about whether or not the darn thing would go 'bang' if needed.

I have had brand new factory ammo not ignite. I have had 80 year old ammo go bang the first time. I don't think you will ever really know which will happen.

Whole lot of worry going on here.
 
I shoot my carry ammo once a month for all of the reasons mentioned - oil, rechambering, and a good dose of "just because." BTW, I've had ammo go bad on the shelf before, and it didn't take 80 years. Maybe the high humidity in S. Florida is a contributing factor. Ammo is cheap enough - protecting myself and my family - priceless. Regards, Keys :cool:
 
Yeah, so my dad's .45 sits at our shop (dry cleaners) and is subjected to the heat and moisture from the presses (both steam and hothead) so much it has pretty well destroyed to gun's blueing. On top of this, he has had the same bullets in it for over 8 years!!! They were cor-bon +ps. I decided it was time for me to shoot them Saturday and out of 16 not one of them malfunctioned. Pretty good I guess :)
 
Bullet setback is some scary $#!^%!! 40 S&W and 357 sig are potant offenders. Just a slight change in cartridge oal is enough to send pressures trough the roof. Setback can occur in one or two chamberings. As for oils and weather degrading the primer/powder, this is certainly possible. For my money though, blowing up a good pistol is the prime reason to change carry ammo.

Dave
 
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