Oh come on, "hail-mary grepping for words of interest" is my first strategy when navigating a new code base, and in 90% cases it led me to right places. If the code you wanted to find uses a synonym, you expand your search. So for example, if "shotgun" doesn't bring anything relevant, search for "weapon" to find a weapon list and learn how the shotgun is called. Running recursive greps on the codebase is a quick and effective way of finding things you need.