Concealment is key, especially if you hope to become a
competent sniper. Having said that, it's always a good
idea to look for signs of enemy activity by peering around
the sides of a building, wall, or hillside rather than
creeping up to the top. While this tactic can restrict your
field of view, it also reduces your profile, making it much
harder for the enemy to find and shoot you. Remember that you lose your scope view whenever you reload
your weapon. During weapon reloads, you should either take
cover behind intervening terrain or drop to the ground until
a fresh magazine has been inserted. Don't fret if you should run out of ammo during a multiplayer
scenario. You can replenish your ammunition by returning to
your armory, provided it hasn't been blown up by the enemy.
After you enter the armory, face the wall with the guns mounted
on it and press C. This will bring up your control panel.
Next, click the Request Weapons button located at the bottom
of the screen. Your ammunition load out will be completely
restocked.