i really dont understand how a scopes turrets can be made for a particular caliber...every bullet will shoot differently from every gun...sure they might get close...but you'll still have to do your range work and figure out if its true, and at what distances it is true....

if you want to seriously shoot long range, id recommend a GOOD scope with target knobs that tracks true...then learn to use a drop chart and "click" in the distance with the target knobs...still requires range work to verify....but once you custom make your own chart, example being 3 clicks up at 250yds, 5 clicks up at 300yds etc, you can range the target, click from your zero, hold dead on and fire...

maybe im missing something with the turrets for the caliber...i dont know...same goes with mil-dots and the various mil-dot variations like BDC...still gotta do the range work and see where those hash marks are true for that particular rifle...