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.
 
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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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I spent the morning testing a, new to me .22 barrel for my RAW Hm1000x with JTS Dead Center pellets and found a nice, sweet spot at 92-93 bar shooting the 18.1gr pellets at 905-910fps. At 50 yards I was shooting the same hole as long as I did my part in the wind. I started testing 25.83gr JTS pellets but I must not have turned my internal reg up enough because I could only get them to about 890fps, no matter if I moved the reg pressure from 120-145 bar. I will try them at a later date after I turn up the internal regulator.

I am wondering if once I find the perfect pressures for different pellets if I can just keep the internal reg turned up and just use the external reg all the time? The internal regulator will them just be a failsafe in case the external reg fails. This rifle is ONLY used as a bench gun so it will always be tethered when I am using it.
 
You have it backwards. You want the Huma to be at the lowest setting. That would then have the external reg pressure in the plenum.
Not correct as you want to open or raise the regulator setting into essentially "BYPASS" so the incoming air pressure set by the EXTERNAL regulator establishes what pressure the valve operates at.
 
I spent the morning testing a, new to me .22 barrel for my RAW Hm1000x with JTS Dead Center pellets and found a nice, sweet spot at 92-93 bar shooting the 18.1gr pellets at 905-910fps. At 50 yards I was shooting the same hole as long as I did my part in the wind. I started testing 25.83gr JTS pellets but I must not have turned my internal reg up enough because I could only get them to about 890fps, no matter if I moved the reg pressure from 120-145 bar. I will try them at a later date after I turn up the internal regulator.

I am wondering if once I find the perfect pressures for different pellets if I can just keep the internal reg turned up and just use the external reg all the time? The internal regulator will them just be a failsafe in case the external reg fails. This rifle is ONLY used as a bench gun so it will always be tethered when I am using it.
If you OMIT the regulator and replace it with a Fast Flow manifold you will start seeing the primary tank act like a larger plenum. Pressure set by the incoming air should make for a very stable & consistent set up when tethered.
 
Any specific manifold that will work with the RAW?
Mostly from back in the days of THEOBEN where Unregulated was used more frequently.
I would check with RAW, and confirm on size threads going into receiver your rifle is utilizing ( As there are 2 thread sizes ) and see if they are producing a "fast Flow manifold" that would replace the regulator ?
 
So, I converted my RAW HM1000X back to 25 caliber so I could start shooting it at 100 yards. It looks like there is a flaw in my tethered setup, at least the way I was hoping to use it anyway. I have the internal reg set to about 170bar so it's close to maxxed out and I am using the external reg to control the PSI to the rifle. With 33.95gr pellets and 125bar I am shooting 880fps, as I increase the bar on the external reg, 130, 140, 145bar the FPS at the pellet actually decreases. At 145 bar the pellets were shooting 850fps. I went home and installed a gauge in the bottom of the block to make sure I was getting the correct pressure and when the external reg was set to 145bar the gauge on the block was also 145bar so I am scratching my head as to why the FPS on the pellet is lower when the reg is set at 145 and higher when its set on 125bar. It looks like omitting the internal reg is going to be the only option
 
So, I converted my RAW HM1000X back to 25 caliber so I could start shooting it at 100 yards. It looks like there is a flaw in my tethered setup, at least the way I was hoping to use it anyway. I have the internal reg set to about 170bar so it's close to maxxed out and I am using the external reg to control the PSI to the rifle. With 33.95gr pellets and 125bar I am shooting 880fps, as I increase the bar on the external reg, 130, 140, 145bar the FPS at the pellet actually decreases. At 145 bar the pellets were shooting 850fps. I went home and installed a gauge in the bottom of the block to make sure I was getting the correct pressure and when the external reg was set to 145bar the gauge on the block was also 145bar so I am scratching my head as to why the FPS on the pellet is lower when the reg is set at 145 and higher when its set on 125bar. It looks like omitting the internal reg is going to be the only option
This is all a game of balance. The regulator pressure must be balanced with the hammer spring, exhaust valve, hammer weight, and hammer travel to achieve your goals. The stock setup is balanced at 145bar for 34gr pellets at 880-930fps. There might be something mismatched with your rifle after you changed it. When you increase the pressure in the plenum of the gun behind the valve, you make the valve harder to open. You must increase the hammer spring tension at the same time as you increase the plenum pressure. There will be a point where the stock spring won't have enough oomph to open the valve far enough to provide the velocity you are seeking. Then you must start changing other things to achieve more power. There will be a limit to how much power is available by changing reg pressure and springs and such, and that limit will be based on the volume in the plenum and the transfer port area for the air to follow and get behind the pellet. You might already know this stuff, but you didn't mention what you've tried.

HTH, Jeff
 
If you OMIT the regulator and replace it with a Fast Flow manifold you will start seeing the primary tank act like a larger plenum. Pressure set by the incoming air should make for a very stable & consistent set up when tethered.
Motorhead, thanks for the great recommendation. Martin had a fast flow manifold in stock so I picked one up and did a short test today. Pellet speeds are back up where I think they should be in the low 900's with the external reg set to 130bar. Best part is I shot 20, 33.95gr pellets with an extreme spread of less than 4fps. I will be able to get out and do some more testing this weekend.