Quick weapon proficiency levels (except launchers)
To get quick proficiency levels with any weapon go to the Dahl Headlands and accept the mission "Big Game Hunter" from Edward Whitting. In this mission you have to collect bait to lure out a Skagzilla (Basiclly a giant Skag) and kill it. After you have killed it and turned the mission in you then quit to the main menu then reload your save, after you have done this go back to where the Skagzilla was and it should have respawned. This time when you fight it go to the side entrance and lure it over there, when it's there jump down from the ledge and the Skagzilla will not move and will constantly opens it's mouth to you (Its mouth is it's weak spot) use any weapon and kill it, this should get you usually up a level in proficiency (mabye more). If you reload the Skagzilla will have respawned again so just rinse and repeat.
Added by: LilTartanJimi Nov 17th 2009, ID#5143