I did some checking around and got my answer, which turns out to be HELL NO. I found this info at http://www.outlawperformance.com/50_BMG_AMMO.htm
For example, I offer the Dominican Republic 50 BMG. A few large lots of 50 BMG Armor Piercing came into the US from the Dominican Republic for public sale. This ammo is identified with a yellow tip.
After a few mishaps from hot loaded rounds in the US, some of the ammo was inspected. The powder was found to have heavily degraded into smaller granules. Through investigation it was found that poor storage techniques in the hot steamy Dominican Republic caused the ammo, even the newer ammo, to get surface oxidization. The ammo was rusting away in its crates. To combat this they tumbled complete loaded rounds, which to remove the oxidization, repainted the tips and packaged it in better cans.
Many people who had large quantities of this ammo in the US broke down the ammo into components to try to salvage them with US surplus powder. Upon inspection many of the projectiles had no gas seal at the bullet base in the jackets. A poor attempt to swage them had been made, but some of the bullets jackets weren’t even long enough to swage.