i dont know if this can apply to the ballistic plex exactly but most bdc reticles can be matched simply by playing with the zoom ring. just shoot at 100 (or 200 is that is what applies to the burris reticle) then shoot at 300, 400, 500 and so on but all groups must be shot on a single larger target. put a big red sticker in the center of each group. go back to your 100 yard shooting position and aim the center of the reticle at the target. start dialing in the zoom ring till each picket covers or is at least close to its corresponding range and your done. make a reference mark on the ring so you can find it again in field. the big drawback to this technique is that you may not be able to use the reticle at max magnification and if your gun shoots to flat your scope might not have enough zoom to compensate for the trajectory. i actually use this technique with mill-dot reticles on rimfires but i only use the first dot