Call of Pripyat help

[naut]

On ammo, carry 3 guns: an automatic, a shotgun and a pistol. Use the automatic on single-shot or burst fire against human enemies. Use the shotgun (carry about 75 buckshot rounds) for mutants. Use the pistol (around 100 rounds) if you run out of ammo for your main weapons.

also, whats the deal with this Noah guy? every time i try to open the door he tries to shoot me. Up until now he talked to me, but now he won't. Is it cuz I got the 3rd helicopter data?

If you listen to what he says when he talks to you you'll figure out that he's absolutely insane. He always trys to shoot you when you open the door, just dodge the shot the go in and talk to him after and say you are a stalker. He won't talk? You may have pressed the wrong dialogue option and offended him, his important in one future mission, so if you can't talk to him any-more you may want to restart.

also I got some fire artifact from the Circus (yay!), is it worth anything? to whom?

Beard. Guy downstairs who sells food, check his dialogue for what artifact quests he has, don't take them unless you have the artifact he wants in your possession though.