RAW Rapid RAW HM1000x Tuning using an external regulator?

I am using a Huma reg on my benchrest RAW 22 and want to try out a bunch of different pellets. I tether the rifle with a external regulator and I am wondering if I was to just open the huma regulator as high as it will go (190 ish bar) could I just attach my external regulator and just adjust from a low pressure up until I find a sweet spot? I could then just go back and adjust the huma regulator to that pressure. If this would work I think it would really cut the tuning time way down.
 
Maybe I am reading this wrong but that sounds back to me. If the Huma is set at the lowest setting then no matter what pressure I set the external reg at then it will still only be at the pressure of the Huma that is in the rifle.
Yes you are correct. Not sure what I was thinking. Full pressure on the rifle, use external reg to fill plenum.
 
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