Phosphorus Bullets

[Vicktacular]

How do I get the phosphorous bullets? I am asking so I can headshot 5 zombies to get one of the challenges. I remember the game telling me earlier but I cannot remember as there are no shops around.

[McGoogles]

http://reddead.wikia.com/wiki/Phosphorus_Coating

Complete the quest for Nigel West Dickens.

You also have to manually apply it to your weapons from your kit.

[CyanideSpirit]

Thanks, this will also be helpful to me :)