It's simple: Rodinal, 1:100, stand (30s agitation in the beginning only) or semi-stand (30s @ beginning, 30s at half way) for 1hr. Develops pretty much any B&W film properly. Yeah, even pushed/pulled ones :LOL:
I use it with 4x5 when I want a pleasant amount of small but sharp grain, and when I have multiple rolls of 120 that I can't be bothered to develop each one separately & differently. Never really fails.