Jordan,
Have a look at this page for some general info on HEAT projectiles:
https://en.wikipedia.org/wiki/High-explosive_anti-tank
The image of the HEAT strikes on the M113 should give a reasonable idea of the penetration and peripheral scarring which is characteristic of these types of projectiles including PIAT (keeping in mind that the hits on the M113 are likely from something more modern than PIAT).