Ok, I know that Vortex states that the BDC is calibrated for 5.56mm. But, I think this would be a good optic for a .308 AR. Surely I can't be the only one to think this? I'm curious if the BDC is even close with M80 ammo.

You could certainly run the ballistics on any round and firearm that will be utilized and come up with a dope sheet that would work using the reticle pretty well. For example on a 22in AR shooting m80 ball ammo and a 100 yard zero the reticle will be as follows:
1st hash - 210yds
2nd - 335yds
3rd - 465yds
4th - 605 yds.

MOA Values:
1st hash - 2
2nd - 5.2
3rd - 9.4
4th - 14.6

Feel free to give us a shout as well at 1-800-4VORTEX ext 1 and we'd be happy to run through any other reticles or ballistic data if you'd like.

I just replaced my PA 5x with the Vortex one because I just cannot get into the chevron.  It is on my SCAR 17 right now but I have not doped it out more than 25-200m but I like it so far.  Wish the adjustments were a little finer is my only complaint.

Appreciate that feedback. We'll be sure to let our product team know that you're looking for some finer adjustments on that optic. Glad to hear you're liking it overall!