Speaking from the experience Autocannon need 3 body shots or 2 headshots to down you with chaos base armor. Know it, since sometimes my "teammates" think my sorcerer back is some kind of terrible foe they must vanquish ¬_¬U

As a frequent victim I can tell you the poison is definitely effective and a nightmare to deal with but as a tactical myself I totally get that it's your only valid option in melee range. I always try to make painboys a priority target mainly for this reason

I'm glad to hear I'm a priority. I know it's effective, two smacks to fully stack. As long as it's not overly annoying, I try to avoid being too cheesy.

It's one of them things that only become annoying when it's spammed by a lot of people playing that class at once, then it does get a bit frustrating but you could say that about almost any of the weapons. I get what you mean about not wanting to be cheesy, I never play JPA for the same reason! I will however admit to the occasional RMB spam if I'm suffering with lag or frame issues

Space Marines, only barely edging out Chaos. Unfortunately, that's all I seem to play against lately...

It doesn't oneshot, a 0 range headshot blast does just a tad higher than 200. You can easily test this in the garrison.