[Carriage Hill]

Look closely at the optics system; BORS w/ powerful Leupold glass. It’s doable. I’ve done it with my Barret, in prone position, equipped with the BORS.

http://www.barrett.net/optics/bors

[smokingfrog]

After determining the range to target, simply turn the elevation knob until the BORS screen matches your target's distance. Internal sensors automatically calculate the ballistic solution. BORS compensates for temperature and barometric pressure, calculates angle cosine and displays rifle cant.