mrmackc, sir, giving heed to your honorable history of NRA instruction (especially for the kids, IMHO) (and the fact that you're a Texan like Wash & I) could you be so kind as to to offer your advice for someone trying to utilize the capabilities of a BDC reticle scope? I have a Nikon 2.5x10 Prostaff 5 in BDC and use the Nikon website's app to record the ballistics info about individual loads used, to know where that particular load will fall on the scope's BDC reticle indicators (what ARE those little circles below centerpoint called ANYWAY??? lol) I know the first circle below centerpoint can be zeroed for 100yds or 200yds, and if I zero to 200 then Nikon's app info might place the round as landing at 192yds (for example). If you were lining up for a shot using the BDC, how much mental calculation would be going into estimating the actual impact point between those little circle?s (windage being another subject for my purposes here) Or, do I have even a rudimentary understanding of how to properly use a BDC and what advice would you have about it? Also, what are your favorite optics for precision shooting?