Which Primary Arms 3-18x50 ACSS reticle for grendel?

[GrendelFanatic]

You can figure this out. First go to the manufacturers web site and go to where they explain the reticle subtensions. For example the Primary Arms SLx 3-18X50mm (this is a .308 - .223 version) it has 4.04 moa at 300 yards, 7.07 at 400 and 10.52 at 500 (there are more out to 1000 yards).
Next using a ballistic calculator put in your favorite load data. Hornady's work's fine https://www.hornady.com/team-hornady/bal...lators/#!/
Now check how close the drop in moa is between the ballistic chart and the substension. Let's use a Sierra 120 pro hunter bullet at 2600 fps. (Calculated at sea level) at 300 yards it drops 5.3 moa, 400 9 moa and 500 it drop 13.3 moa.

Thanks! I’ll look into it.