JBM ballistics has a free - and spectacular - online ballistics calculation machine.

Your elevation is about 350' above sea level.
Temperature yesterday was hovering right around freezing.
Humidity was about 93 percent
Barometric pressure was about 29.7" HG

2.1 center over bore sight height
2450 fps ten feet from the muzzle
400gr PP, G1 BC at .340

If your impact was a half inch high at 50 yards, your zero would be 165 yards.

Punch that into JBM ballistics calculator and have a look.
Screw with your zero range to agree with whatever you've recorded on paper.

http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi

Cheers
Tinker