If you want to go for a high round like 50 or 100 in a speedrunning matter, you should not be camping. Camping takes a while, what I'd recommend you to do instead is gather 3 perks (Notably Double Tap, Juggernog and Quick Revive), grab 10 guns (All Pack a punched (You MUST have PAP Raygun and PAP Crossbow (PAP Raygun to save yourself (PAP Crossbow to also save yourself, but also distract the killers and lead them to another direction (kind of like monkey bomb))))) and then stay out in 1 spot where the killers come from only one barricade.
The image below shows a spot where you should be at (Corner of the wall on the right of the 2 large hangars), where killers only come from 1 barricade, the one next to the lab room.
With the new Contamination Update releasing, we have decided that some of these categories need an update due to the fact that it has changed drastically (obviously)
All currently submitted runs to categories such as Pack A Punch will be moved into a legacy section (similar to how it's done with kr