I've been using 800x from the Calhoun sight in my 222 Rem, 223, 5.6x50R Mag and 22-204 for small game loads and finishers. I also run 800x in the 25-204 with cast bullets. The Calhoun info has been around for a very long time, they started with 800x and then went to BlueDot, I never made the transition as 800x worked just fine for me.