All 6.5 Creedmoor...

81500 is 140gr ELD-M Match Ammo
81501 is 147gr ELD-M Match Ammo
81499 is 143gr ELD-X Precision Hunter
81493 is 140gr BTHP Black Ammo

Hornady Black in 6.5 Creedmoor is apparently an "Academy only exclusive" which probably is why it's not listed on Hornady's website (https://www.hornady.com/ammunition/black#!/). Mail order only if you live outside south, southeast, or midwest.