Do you guys know if Winchester uses primer sealant on their self defense ammo? I bought two boxes of PDX1 ammo and noticed what looks like sand or salt crystals in the crease around the primers; both boxes. I just received three boxes of T-series, and see the same on all three boxes of that. Two different series of ammo, two different sources, weeks apart. Seems too coincidental not to be intentional. The only thing I can think is sealant. Anyone know?