Hello Chad. I just mounted the 3-9X 42mm RR600 on my D-Tech AR, and it looks good (gonna have to get taller rings tho with this setup to get to the charging handle). The stadia subtensions are set up for a 200 yd. zero, and follow the trajectory of various cartridges similar to the 243 Win. using a Sierra 100 gr. SBT @ 2950 mv (i'm assuming sea level, SAP). I live at 4600 ft., and running the ballistics of the load Mike Milli gave me of the 87 V-Max (.4 BC) @ 3100 +/-, the stadia subtensions don't add up to even hundred yd. intervals (thank God--i don't like boring reticles, as it's no fun to write about them honestly).
Here's what i will do. Chad supplied me with a schematic of the reticle detailing the subtensions of all the stadia points, lines and dots of that reticle. I'll just recal. as mentioned above with my other AR upper, check at the range, make up a dope sticker and stick it in my BC scope cap cover, once tested and troubleshot if necessary. The scope comes with 25 different load combinations that match the reticle stadia at even hundred yd. intervals making interpolation simple.
With the load i'm using the RR600 becomes a "RR 650" sort of, as the "600 yd." stadia @ 11.4 MOA matches the ballistics profile of my load to that range--nice, IMO. Now If i wanna go further they provide a nice little low profile tgt. turret that'll give me an additional 14 MOA of elevation beyond the lowest stadia's zero which according to the ballistic profile will get me to 1000 yds. using the lowest stadia for windage reference (i don't run turret windage clicks for big game and coyotes).
The stadia r great for reticle rangefinding as well if u're into that sort of thing.