I would think assembled ammo is better "sealed" to the humidity, especially as opposed to primers sitting in their trays and boxes.
As for vacuum packing ammo, I think your buddy might be a bit too anal on that one. Is he comfortable buying factory ammo at the local shop? Ever seen it vacuum packed on their shelves? whistle
Wouldn't the finished cartridge be basically "sealed"?? I don't know how much humidity/temperature control is involved but they're still pulling mil/sup ammo from WW2 out and it's still going bang.
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