It really gets even more specific for "long range"; like what type of shooting? I found quite a range of unqualified, general answers, when I looked into this too and upon searching more and talking to / observing others I determined the following. At 1000 yards if you shoot with the F-class or paper-target guys, ie smaller groups are better, they want as much power as possible as long as you can see past the mirage; 30-50X if possible. Shooting steel at 1000 in tactical situations a max of 10-15X is suggested so you have a better field of view and can see where the misses hit in order to call and make your own adjustments; in that case matching reticle and turrets are desirable. Like TRex says in his Sniper 101 series, all this becomes a very "mission specific" adventure that you really need to consider in advance in order to make the best decision. Of course the same logic goes for stock selection, etc but that's a different story.