How to know what psi to use?

Discussion in 'Gas Powered Guns' started by toast_crunch, Jun 16, 2017.

  1. toast_crunch

    toast_crunch New Member

    I dont know if this is in the right section but Hpa is gas so i figured it was. Anyway, I was just about to purchase a hicapa then hpa tap a custom drum mag for it and I was wondering how the whole psi thing works. Is there like a way other than sitting at a chrono and tweaking the regulator to find out what psi you need for a certain fps. The limit at my cqb field is 350 by the way. This might seem like a stupid question but I'm clueless. Thanks