vacuum packing handloads?

[Mr. 16 gauge]

Well, I was fortunate to have a bunch of components on hand prior to the Obamination, so I loaded all that I had.....223, .308, .30-06, 9mm, 38 special, ect, ect. I also loaded enough steel shotshells to probably last me the rest of my lifetime (literally).
We also have one of those vacuum sealers...they type that you use to preserve food in the freezer. I have been wondering if maybe I shouldn't vacuum pack the majority of my ammo (in small lots, such as 50-100 rounds per rifle, 100 or so for pistol) in order to help keep it 'fresh'.
Anyone ever done anything like this? I know years ago I bought some military 7.62x39 (Czech) that was vacuum sealed. Can anyone think of a reason NOT to do this? Thanks in advance.............