Me thinks you picked up reloads with Hornady bullets. Several reloading outfits use Hornady bullets in their ammo. Hornady would NOT use Winchester brass in factory ammo.
I talked to Hornady today about an issue I had with one of their products. After they resolved My Issue with No problem.
I asked about the ammo and the 223 Winchester Brass. The gentleman Told me that yes in deed they were using Winchester brass and they had bought over 4 Million Pieces. The reason was, with all of their Police and government contracts they could not keep up with production. He also said they are adding on to the production Lines. He went on to tell me that they tried to work a deal with Remington also. But Remington was having trouble Keeping up as well.
I found this all to be Interesting, How Big companies Are working Together To keep production going.
Now if we could just get the rest of the World to do this!