accuacy with the SR-25 or similiar is astounding. This is a "blurb"...
"On a bullet-drop-compensating scope, the elevation knob has, as its increment markings, yards or meters . . . not 1/4 MOA markings (for example). To hit a target at 500 meters, just set the elevation knob to "5." To hit a target at 300 meters, just set the elevation knob to "3." The knob has graduations from 1 (for 100 meters) out to 10 (for 1000 meters). If you know the range of the target, you can hit it every time very rapidly. For every different caliber gun on which the scope is used, a standard load has to be used, as well as a properly calibrated elevation knob. The disadvantage to this sort of setup is that the ammunition used has to use a certain projectile fired with a certain muzzle speed. The shooter cannot use any bullet desired which is launched at any speed desired. The Leupold MK-IV M3's 7.62x51 elevation knob is calibrated for 173 grain bullets launched at 2550 fps. The scope came with elevation knobs calibrated for the following cartridges: 5.56x45, .308 Winchester (7.62x51), 30-06 Springfield (7.62x63), and .300 Winchester Magnum (7.62xA whole bunch of millimeters!). If you want to be able to shoot any handload through your weapon, then get the MK-IV M1. All I'm going to shoot through my SR-25 is the Federal Gold Match, so the M3 should work fine (Note: the Federal Gold Match in 7.62x51 uses a 168 grain bullet as opposed to the 173 grain bullet for which the dial is calibrated. This works fine out to 500 yards. It might throw things off at greater distances, in which case I'll just need to pick up some Lake City Match Ammo! Of course, I could just learn how to adjust the scope, accordingly, to compensate)."
I picked the SR-25 since I've shot it. The best ammo for the SR-25 is 168 grain match ammo. Correctly adjusted and calibrated with scope and tripod you can easily hit a coke can at 500 M. You can hit at 1000 if wind conditions are right. The gun is so consistant that its drop (with match ammo) is amazingly consistant. The range I shoot at isnt long enough for measured distance shooting (The NRA nationals are only 600 yd for example) so I have no 1st hand experience at 1000M....but my understanding is site is accurate all the way up to 1000M.