The issue of ammo caching and the effects of age have crossed my mind. In discussing the the viability of milsurp ammo as a long term option I have to ask if age has an effect on velocity.

I mean, it is generally conceded that older sorts of corrosive type ammos are different than modern ammos, and as such keep indefinitely if properly stored.

However...when trying to get answers as to the modern ammos of the last 40 years or so, I've found differing views. some say "No Problem" others claim a loss of velocity over time.

Has anyone chronoed various lots of older rounds to document the effects one way or another? I mean, I believe that the Hitach website has a test where 7.62x39 ammo was tested over the span of lots manufactured in differing years. Their data indicates a velocity loss, but it must be remembered that they are in the biz of selling ammo, and as such might not be too objective.

Can anyone offer insight?

Also, what is the velocity of Nato .308 as compared to commercial .308?

Thanks...

Do yoy have assess to a Chrono? If so, Just buy some mixed headstamp ammo and test it yourself.
I have to believe that ammo, if properly stored cal last longet than you or I can, withous substancial detriment to velocity.