Something is wrong somewhere. Were you shooting into a headwind? Here is the ballistic chart for that round
Ballistic Coefficient .210 Velocity (ft/s) 1825 Weight (grains) 250
Maximum Range (yds) 500 Interval (yds) 100 Drag Function
Muzzle 1825 1849 -1.5 0 0 0 0 0
100 1506 1259 0 0 0 0 0 0
200 1248 865 -14 6.7 1.9 0 0 0
300 1073 640 -50.4 16 4.7 0 0 0
400 967 519 -116.9 27.9 8.1 0 0 0
500 892 442 -220.5 42.1 12.2 0 0 0
At 200 you shouldn't be more than 14-16 inches low give or take a couple inches. -36 inches then either your estimation is WAY off or you were shooting into a pretty stout wind.