With little to go with, I chose the 30-06 with a 165 gr bullet @ 2800 fps. If it was 2" high at 10 yards it would be somewhere around 31" high at 100 or zeroed for 1100 yards. I didn't bother to change many inputs. Elevation 7500 ft, 35 degrees.
Here is JBM so you can figure out what it will do with your mystery firearm:
http://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi
