I'm looking at picking up one of the PA 1-6x24 scopes with the ACSS reticle. I checked with PA to see whether I needed to go with the 5.56/5.45/.308 one or the 7.62/300BO one. They told me to go with the 5.56 one. Has anyone used this scope with their 6.8? If so, what was your zero? How close are the holdovers to the 5.56?