Use zero a 200 yards on the tip of the Chevron and then the ACSS radical without the griffin is calibrated in yards. The griffin is a Mills the turirits are in Mills.
Look here from Primary Arms https://www.primaryarms.com/primary-arms-compact-plxc-1-8x24-ffp-rdb-riflescope-acss-griffin-mil-g2-reticle
Go to the picture with the blue overlay showing the example 200 yard zero for 308
The idea is that if you zero it at 200, the round number distances (approximately) line up with the milrad lines.