The numbers are usually the range for non-reflective targets. I went to Nikon and pulled these specs for you and it confirmed that it is 1200 yards. I use Nikon for my rangefinder, which is the 400. I don't need more than that for bowhunting. I also use the Monarch 10x42 ATB binocs and I have 2 different Monarch scopes for my .270 and my TC Encore. As you can see, I am a big Nikon fan. I pulled the specs for the Bushnell as well for you.

Here is the link as well as the specs.
http://www.nikonsportoptics.com/product.php?group=16&subgroup=13&product=7 487





Focusing System (Diopter): +/- 4



Magnification x: 7



Objective Diameter (mm): 25



Angular Field of view (Real): 5



Angular Field of view (Apparent): 35



FOV @ 1000 yds. (ft.): 262



Close Ranging Distance (yds.): 11



Exit Pupil (mm): 3.6



Relative Brightness: 12.9



Eye Relief (mm): 18.6



Size (L&W) Inches: 5.7x3.2



Size (L&W) MM: 145x82



Weight (oz): 9.8


Bushnell Information...
http://www.bushnell.com/products/rangefinder/specs/20-5100.cfm









7 x 26mm

20-5100







MODEL
RANGE
(yards)
MAGNIFICATION
X OBJ LENS
FIELD-OF-VIEW
ft@1000yds
EYE RELIEF
SIZE
(in / mm)
WEIGHT
(oz/g)

20-5100
5-1500
7 x 26
340
19mm
1.7 x 5.1 x 3.7
43 x 129 x 94
11.8/ 334











BATTERY
TYPE





RANGING PERFORMANCE (yards)

CASE
SCAN
BULLSEYE™
BRUSH™
RFLCTV.
TREE
DEER
FLAG
ACCURACY

9 Volt
Carrying
Case
Yes
Yes
Yes
1500
1000
500
400
+/- 1