looking at a Trijicon 1-4 accupower for my Scar 17. It’ll be 13.5” sbr. Im looking at using the .223 BDC reticle, due to the ease of use in CQC. But after say, 200 yards, how can I use the reticle to my advantage? Insert basic 55gr. .223 and my .308 cartridge into a calculator, and adjust for the drop? Im fairly new to scopes, so any info would be great. I dont plan on using the scope further than 300 yards, realisticly.