Bullet Drop Chart:
the above chart should still be right.
removed rest because denkirson is doing good charts.
http://denkirson.xanga.com/722757523/bad-company-2/
not sure if these threads are useful or not, I don't want to check.
http://forums.electronicarts.co.uk/battlefield-bad-company-2-pc/942876-weapon-stats-damage.html
http://forums.electronicarts.co.uk/battlefield-bad-company-2-pc/946724-vehicle-packages-what-do-they-do.html
and for consoles:
http://forums.electronicarts.co.uk/battlefield-bad-company-2-ng/939323-bfbc2-weapon-stats.html
BFBC2 Information