Huma regulator in a .22 Wildcat - Starting pressure setting

That's probably about right for 18gr pellet and 500mm barrel. Could turn it down 5 bar if you really wanted to change it before putting it in.

If you think it's too high then you could turn it down.

Either setting should get you the velocity you want.

If 130 bar is just right, then 135 bar might be better for a more efficient shot. Same can be said if 125 bar is just right, then 130 would be better.

At least with the WC it's not difficult to remove and adjust. Just make sure to get the proper clearance for the pellet probe when you put it back together.

I have mine set at 130 with a larger plenum.

The huma reg is much smaller then the factory reg which means you can't use the factory plenum spacer if you want the breather hole lined up correctly. From what I remember, I think you need a 15 mm spacer

My experience with Huma regs is limited to one installation on my FX Royale 400 in .22, so take it for what it's worth. I found the scale on the reg to be very unreliable, an estimate at best. When I got the tuning I wanted, the scale on the reg indicated 150 bar, but when I shot a complete chrono run, the actual pressure was something around 120. That was yielding about 880 fps with the JSB 18. That's assuming my rifle pressure gauge is reasonable accurate, and I believe it is. 

If you think it's too high then you could turn it down.

Either setting should get you the velocity you want.

If 130 bar is just right, then 135 bar might be better for a more efficient shot. Same can be said if 125 bar is just right, then 130 would be better.

At least with the WC it's not difficult to remove and adjust. Just make sure to get the proper clearance for the pellet probe when you put it back together.

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I don’t mean to hijack, but what do you mean by proper clearance of the pellet probe ? And how do you adjust it ? 

Check the ernest rowe or AoA videos....I'm pretty sure you can find the procedure on that.