System Shock 2 -
There's a box of standard bullets next to the turret, but going there is tricky this early in the game. The easy way to get that box is to do the following: get into the above position and crouch. Target the area shown and use psi-pull. If you do it correctly you'll be able to get the bullets without even seeing them. The harder way is to run, take the bullets and run back. But be ready to take a few rounds from the turret if you do.