by 1gewehr » Sat Jan 07, 2012 6:04 pm
I'll take a swag and say that loaded factory ammo is best for long-term.
In the early '90's I ran across some bargain .30-06 and .303 ammo that was all dated 1918 and 1919. It was all sealed in the original cases and was clean and bright when I opened the cases. Every single round fired perfectly, except for a few of the .303 which showed a very slight hesitation before going 'bang'. I have a bunch of WWII-dated 8mm, .30-06, .303, and 9mm which has all been very reliable and accurate. I also grab all the factory .250 Savage ammo I see for sale at decent prices. And a LOT of it is at least 60 years old.
But the oldest factory ammo I ever fired is some .56-56 rimfire Spencer ammo made in the 1880's a friend bought in the early '80's. We fired twenty-one rounds from three boxes selected at random from a case. All rounds fired perfectly. Imagine that!
The only times I have ever run across bad ammo is when it has been poorly stored and is discolored.
Nemo me impune lacessit