30 Kills: T-Bolt Sniper Trophy in Uncharted 3: Drake's Deception

The T-Bolt is a sniper rifle in much the same fashion as the Dragon. It has all the same aspects as it's counterpart, low ammo capacity, slow reload rate etc. but is ideal for taking out distanced enemies and those that need something with a bit of punch to drop them. The first place you can pick one of these up is in Chapter 16 - One Shot at This in the hangar/garage area, dropped by one of the enemies and also in a blue container. Here's a couple of places to farm kills:

Chapter 19 - Settlement

This place is pretty much the best farming area in the game and somewhere to consider grinding for the Survivor trophy if you don't already have it. After you shoot out the supporting beam to advance in the beginning stages of this chapter you will take out a dude with a laser equipped gun. This is the T-Bolt so pick it up then hop on up over the next ledge and take cover against the small wall in front of you. Ahead of you are enemies in all forms, take them out with your super precision rifle making sure all 5 shots count if you can before restarting the checkpoint. Rinse and repeat until you have all the required kills.

Chapter 22 - Dreamers of the Day

Another sweet spot is right near the beginning of this chapter. After you clear the stairs as you start, taking out a few bad guys en route plus a few distances enemies with laser weapons, take the ladder up in the small alcove you reach at the top. There's a T-Bolt perched against the wall and a score of enemies come rushing out of cover below for you to take out. Pick them off and restart the checkpoint as and when you run out of ammo.