This thread is fill of good information, was just wondering what power setting my Centerpoint 4-16 was supposed to be because it didn't say in the manual. I remember I calibrated a Leapers 3-9 years ago at 25 yards just by making sure each mildot was 1 inch and it worked well enough. I like the idea of measuring them at 10 meters to calibrate the magnification thoughEditWell I went the range with my Centerpoint 4-16 and the magnification reing seems right, for 10x at least. I drew dots .9" inches from each other and the dots matched them at 25 yards. My measurinf wheel broke before I could measure ten meters and calibrate the mafnification ring :-(