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google search for some ballistics softare, At 850 yards a 30mph crosswind will move~make a 175 grain .308 drift sideways almost 60 feet. At 850 yards a 175 grain at 2500fps drops 24.6 feet also. Just a bit of info i thought would be worth adding.

Here is what I come up with, making certain assumptions ... maybe 56' isn't too far off the mark (so to speak) assuming 40mph 90 degree crosswind:

Sight in Distance, yds: 200 Shooting Angle, °: 0
Cross Wind Velocity, mph: 40 Cross Wind Angle, °: 90
Site Height, in: 1.5 Temperature, °C: 75
Barometer, mm Hg: 29.55 Elevation Above Sea Level, ft: 300
Point Blank Diameter, in: 10 Point Blank Range, yds: 266
Muzzle Velocity, ft/s: 2800 Ballistics Coefficient: .315
Bullet Weight, grains: 150
Distance, Time, Velocity Energy, Drop, Dist From Line Drift,
yards sec ft/s ft-lb in of Sight, in in

====== ====== ====== =====

=====
000 0.0000 2800 2611 0.00 -1.50 0.00
025 0.0271 2730 2483 -0.14 -0.18 0.24
050 0.0549 2662 2360 -0.57 0.85 0.97
075 0.0835 2595 2242 -1.31 1.57 2.20
100 0.1128 2529 2129 -2.37 1.97 3.95
125 0.1428 2464 2021 -3.76 2.04 6.22
150 0.1736 2399 1917 -5.51 1.74 9.08
175 0.2053 2336 1816 -7.64 1.07 12.53
200 0.2379 2273 1721 -10.17 0.00 16.59
225 0.2713 2212 1629 -13.12 -1.49 21.28
250 0.3057 2151 1541 -16.51 -3.42 26.63
275 0.3410 2092 1457 -20.37 -5.82 32.67
300 0.3774 2033 1377 -24.72 -8.72 39.41
325 0.4148 1976 1300 -29.60 -12.14 46.90
350 0.4533 1920 1227 -35.03 -16.11 55.15
375 0.4930 1864 1157 -41.06 -20.67 64.21
400 0.5338 1810 1091 -47.70 -25.86 74.10
425 0.5759 1756 1027 -55.01 -31.71 84.86
450 0.6193 1704 0966 -63.02 -38.26 96.53
475 0.6640 1652 0909 -71.77 -45.55 109.15
500 0.7101 1603 0855 -81.32 -53.65 122.74
525 0.7576 1555 0805 -91.72 -62.59 137.33
550 0.8066 1508 0757 -103.02 -72.42 152.96
575 0.8571 1463 0713 -115.27 -83.22 169.66
600 0.9091 1419 0671 -128.54 -95.03 187.45
625 0.9627 1377 0631 -142.86 -107.89 206.31
650 1.0180 1336 0595 -158.35 -121.92 226.39
675 1.0749 1298 0561 -175.06 -137.17 247.62
700 1.1335 1262 0531 -193.07 -153.73 270.00
725 1.1938 1228 0503 -212.46 -171.65 293.55
750 1.2556 1196 0476 -233.29 -191.02 318.25
775 1.3192 1166 0453 -255.65 -211.92 344.11
800 1.3842 1139 0432 -279.63 -234.45 371.08

I went back and did a little vector diagram on an envelope, and it is possible after all (the wind would have to be around 50-60 mph, and there would have to be a lot of correction for bullet shape and initial velocity, which I assumed to be about 3200 fps). I would like to try this shot myself!

I am chastened.