I know that the P99 code is branched from this and not public, but curiously there is a very familiar number in a custom damage cap for shaman listed in the public code as part of a section supporting hard-coded class based caps.
Line 1303:
https://github.com/EQEmu/Server/blob...one/attack.cpp
else if (level >= 40) {
switch (GetClass()) {
case CLERIC:
case DRUID:
case SHAMAN:
cap = 80;
break;