Is it possible to totally wipe them off the face of the Wasteland? Anyone tried it? So they ain't there after the 'end' still killing and rampaging?

Well, you can take out the Powder Gangers at the NCRCF and Vault 19, but the small gangs at the smaller camps or those that wander will still respawn I think. But, if you take out the NCRCF and Vault 19, you've effectively destroyed them, and the end game will say so.

Many thanks

You get that ending slide because you haven't t dealt with Vault 19.

No, you get that ending slide because you killed all gangers in NCRCF and V19, it wouldnt show it otherwise because its the only slide for killing both.

This.

Wrong, NCRCF PGs and V19 have separate slides. Nothing ele for the PGs, check the wiki.

The NCRCF PGs only stay if you side with yes man or mister house AND don't kill Eddie.

Also you don't have to *kill* the V19 gangers.

In MY game I got one slide mentioning the destruction and scattering of the powder gangers at NCRCF and Vault 19 by killing Eddie and Cook and all other leaders. I dont pay much attention to what the wiki says since pretty much any hoodlem from the net can change the whole thing. One time Head Paladin Harden was a pormstar...so yea

Wrong forum?
http://www.gamesas.com/index.php?/forum/108-fallout-new-vegas-cheats-hints-and-spoilers/

Yeah and Ulysses used to be the Courier's lover. But the ending slides are pretty straight forward, just get them from the game files and list them. I think that one's credible as it's in line with my own findings (nice way of thinking innit ). Are you sure those aren't two slides? They're right next to each other.