I noticed a few days ago that MidwayUSA had some Hornady Zombie Max ammo in their “new” section with a listed caliber of 300 Blackout, as opposed to the previous version which they had originally done as 300 Whisper. Hornady was sort of ahead of the curve on the .300 BLK explosion, and they went with the nomenclature of .300 Whisper, even though their loading was a match for BLK. I have both versions and not only are the cartridges identical (except for headstamp), the index number from Hornady is the same - 80890. They appear to have just changed the label from Whisper to Blackout and have left everything else the same except that the blackout cartridge has a headstamp of Hornady 300 BLK. The lettering on the headstamp is very fat and is poorly done since the letters all squish together. I wouldn’t be surprised if they have the headstamp redone to clean it up, and Hornady is always changing their headstamps anyway.