You can get Horus in Bushnell,Ziess,Leo,NF,PREMIER,S&B,USOI think he is saying Z-800 as well. You could run the turrets all the way out to 1K and then calculate the holdovers for the reticle. I do not have this model scope but beleive that is what most software will allow you to do if it has this reticle on the list.
How is the Horus glass? I am getting a leupy with the Horus reticle but was not sure how their own glass compared. If I like this setup I may look directly at the Horus models.