Divide 3600 inches in 100 yards by 7.2 inches center distance between scope blocks and you get 500. Each click moves the telescope one-half of one thousandth of an inch. The adjusting knobs are marked in 25 divisions, and there is a click between each division, so there are 50 clicks per revolution of the knob. These sights attach to "scope blocks" on the rifle barrel, which are most often 7.2 inches on center. It is entirely practical to move these sights from rifle to rifle, re-setting the sights each time.
They have adjustments on the rear for focusing the crosshairs, and on the front (Fecker in the center) for eliminating parallax.
These have adjustments built into the mounts that are (mostly) click adjustable and clearly readable so that settings may be recorded. Outside adjustable telescopic sights include Lyman Targetspot and Super Targetspot, Unertl, Litschert, Fecker and Davis brands. Telescopic sights may be categorized as "Outside Adjustable" and "Internally Adjustable." the spacing of the 2 bases is 6.5 " center to center? I don't want to drill any more holes in the barrel of course, I would assume the spacing between the bases has something to do with the calibration on the mount adjustment.
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