If that is true, then I apologize for my bad advice. I have the Monarch 3-12x42 but actually wanted the M223 and do have it on a 223 cal rifle but shooting 55gr bullets. I never came across anything that said that it had yard calibrated elevation.
For about $70 you can get the MOA turrets. Nikon Monarch 1/4 MOA High Pro Turret Kit - MidwayUSA
They are sold with covers, so I don't know if they are weatherproof. Typical for Nikon there is little info available. I criticize, but have been very satisfied with both of my Nikon scopes (also have the 4-16x50 SF on my 8mm Mauser).
Leupold makes a retractable tape type device that mounts to the scope tube that you can put your bullet drop data on, so that it is readily accessible in the shooting position.
Here is another source that appears to have the MOA turrets in stock for $56
Nikon Monarch New Items - Other Items
Skip the M223 then and get the regular 3-12x42 Monarch and add the turrets
Nikon Monarch Rifle Scope 3-12x 42mm Side Focus BDC Reticle Matte - MidwayUSA
Its even cheaper at $380.