I also just got into the pinhole stuff and have used HP5+ with OK results. I've just used some Acros w/o adjusting for reciprocity & it looks fine.
There are several pinhole sites out there with lots of information. f295, pinhole resource & others. F295 has an active group like APUG.
The aperture on my camera is f235 so I made a mark on my meter @ f64 & just increase the time by two stops rather than deal with multiple increases of time.
I used f64 because my calculator dial ran out of time indicators.