Daystate Huntsman .22 Regulator pressure

[EPG]

I picked up the FAC Huma regulator for my Huntsman. It came with a plenum.

My Huntsman is a Regal with 250 bar fill pressure- its less than a year old. It shoots JSB 15.89 at 885fps very well for 60 shots with a spread of 45fps.

I know, why add the reg… well, its winter so time to work on guns during days when its too miserable to shoot - and so I thought I’d try it with the reg to see how it performs.

My use case for this Huntsman is primarily targets - because it has been insanely accurate with JSB 15.89 pellets- both Hades and regular domed.

Huma set the reg set at 130 bar.

Questions:
What is the factory regulator setting for a FAC Huntsman?

Is 130bar adequate to shoot 15.89s somewhere in the 850-880 range?

Is the plenum necessary to get 850fps with the 15.89s?

Thanks,

Ed

 

[elh0102]

From looking at your chrono run, I'm guessing you will need to be closer to 160 with your set point. And your chart seems to show that no, you don't need the larger plenum to reach your goal of 850 fps.

 

[SilentSquirrel]

@elh0102
Are you suggesting that the Huma regulator be installed without the plenum?
If so, please explain why/how plenum is not needed
Not being critical.
Simply hoping to learn
Thanks
Ed

 

[elh0102]

@elh0102
Are you suggesting that the Huma regulator be installed without the plenum?
If so, please explain why/how plenum is not needed
Not being critical.
Simply hoping to learn
Thanks
Ed

I had a Huma reg installed in a Huntsman several years ago, without an additional plenum. I believe it was tuned to shoot in the velocity range you want, but it's been several years, and I no longer have the rifle. My current Revere has the factory installed Huma reg, and it shoots the 16 grain around 880 I think, and again, no additional plenum. Its set point appears to be 160 on the gauge. The velocities and pressure indicated in your chart also show the production of that velocity at an ending pressure of 165 bar. Again, an indication that the rifle can do what you want without the additional plenum. There could be other advantages in having the larger plenum, but I have no experience with it.

 

[jking]

I added a Huma to mine a couple of years ago and I set mine to 160bar which was where my peak velocity was close too. I'm shooting the 16gr at 885-890 for probably 35 shots, maybe a few more. You're going to need to run the long FAC plenum too. Without it you won't have enough stored HP air to propel the pellet at the speed you want. I had tried a Altaros regulator which didn't have a plenum on my previous Regal. Very low velocities, like in the 700fps if I remember correctly.

 

[elh0102]

@elh0102
Are you suggesting that the Huma regulator be installed without the plenum?
If so, please explain why/how plenum is not needed
Not being critical.
Simply hoping to learn
Thanks
Ed

I just noticed, the Huma reg pictured is the short one, not the longer FAC model. Maybe that is causing confusion with reports of different experiences.

 

[Emu]

The higher the regulator the lower the fps.

That is because hammer may not open correctly the valve because of to much preassure.

Best thing to do is to fill the rifle in steps and measure fps. First to 80 bar, then to 90, then to 100 and so on. When fps strat decreasing that mean than regulator should be at previous filling preassure.

 

[EPG]

I just noticed, the Huma reg pictured is the short one, not the longer FAC model. Maybe that is causing confusion with reports of different experiences.

I ordered the FAC regulator for my Huntsman.

The picture shows what HUMA sent me - the reg with a plenum. There was an even larger plenum available, but I chose the “standard” FAC version.

-Ed

 

[elh0102]

I ordered the FAC regulator for my Huntsman.

The picture shows what HUMA sent me - the reg with a plenum. There was an even larger plenum available, but I chose the “standard” FAC version.

-Ed

If I'm reading the Huma site correctly, the "standard" reg in your picture is for 12 fpe rifles, not FAC. It's kind of confusing, but it might be worth reviewing. Maybe they are saying that the smaller standard reg, with the additional plenum, is preferable over the longer FAC reg alone?

 

[Motorhead]

As with "Most" regulation conversions ... getting the balance correct to have rifle run at OEM non reg power and be efficient in doing so .... Takes more than just dropping in a regulator
* Understand you asking for the same power on LESS pressure .. no free lunch here and you need action to breath better to have that happen.
Lighter poppet spring, usually tad larger transfer path from valve to barrel along with hammer strike changes.
With daystates Harper Slingshot hammer that can be stroke of inner striker changes and spring rate if needed.

 

[EPG]

If I'm reading the Huma site correctly, the "standard" reg in your picture is for 12 fpe rifles, not FAC. It's kind of confusing, but it might be worth reviewing. Maybe they are saying that the smaller standard reg, with the additional plenum, is preferable over the longer FAC reg alone?

This is exactly what I ordered and received from HUMA:

 

[EPG]

As with "Most" regulation conversions ... getting the balance correct to have rifle run at OEM non reg power and be efficient in doing so .... Takes more than just dropping in a regulator
* Understand you asking for the same power on LESS pressure .. no free lunch here and you need action to breath better to have that happen.
Lighter poppet spring, usually tad larger transfer path from valve to barrel along with hammer strike changes.
With daystates Harper Slingshot hammer that can be stroke of inner striker changes and spring rate if needed.

I’m a big fan of non-regulated guns. I do understand that dropping in a regulator will not be the only change necessary to optimize the regulated setup.

My Huntsman shoots incredibly well unregulated. I like to tinker so I thought that I would drop in a regulator and see how it goes - as these regs are relatively inexpensive.

I’ve already had the rifle apart a few times, fixed a leak, polished valve seat, polished bolt, etc - its a super simple rifle to work on and adding a reg to the air tube is easy on the Huntsman.

It makes sense that based on my chart, I will likely need the reg set to 155-160 bar to achieve 850+ fps - if I change nothing else on the rifle.

If shot count suffers with the reg, I may test how accurate the rifle is with the 15.89s at say 135 bar and hopefully about 800-820 fps. If accuracy stays the same as unregulated accuracy and I get increased shot count, then I may leave the regulator in. If accuracy suffers or shot count decreases, I’ll pull the reg out.

 

[elh0102]

This is exactly what I ordered and received from HUMA:

View attachment 316273

My mistake, I understand how it works now. The site photo is with the plenum attached, and that confused me, sorry.

 

[Motorhead]

Reason you will need SUCH HIGH pressure ( Stated 155-160 bar ) is simply due to LACK OF sufficient flow due to strangled flow.
Correctly set up you could easily get equal power on just 120-130 bar and YES, get more shots too

 

[Joedirt199]

I tried a reg in my .177 huntsman and couldn't get it to seal. Air kept getting past the reg and leaking out the air tube and receiver connection. Gave up and just use it unregged. I can shoot from 200 bar down to 175 bar with only a 20 fps swing for 60 shots. Easy enough to hand pump.

 

[bigmike]

Just ran my .22 Huntsman Revere over the Chronograph. Shooting 15.89gr pellets 885 fps with a 165bar regulator pressure. Bought the gun used but pretty sure this is the factory reg pressure.

 

[EPG]

I tried a reg in my .177 huntsman and couldn't get it to seal. Air kept getting past the reg and leaking out the air tube and receiver connection. Gave up and just use it unregged. I can shoot from 200 bar down to 175 bar with only a 20 fps swing for 60 shots. Easy enough to hand pump.

Which regulator did you try - was it a Huma?

My Regal is very recent, probably one of the last Daystate manufactured. It has the 250 SWP (Safe Working Pressure) stamp on the tube (I think older Regals were 230) and when I unscrewed the air tube, the threads appear to have the groove for venting a regulator precut.

 

[tommyb]

Just ran my .22 Huntsman Revere over the Chronograph. Shooting 15.59gr pellets 885 fps with a 165bar regulator pressure. Bought the gun used but pretty sure this is the factory reg pressure.

I think my Revere is the same for velocity and reg set point with the 15.89 — factory settings.

 

[jking]

The higher the regulator the lower the fps.

That is because hammer may not open correctly the valve because of to much preassure.

Best thing to do is to fill the rifle in steps and measure fps. First to 80 bar, then to 90, then to 100 and so on. When fps strat decreasing that mean than regulator should be at previous filling preassure.

Or just go to 160 and see if it satisfies. Remember every time you want to make an adjustment means de-pressuring, pull the regulator, tweaking it, re-installing, re-pressurizing, checking velocity, pulling the reg back out, etc. , Been down this road before..

 

[Emu]

My Vulcan 3 .30 Cal works the better at 135 bar..... And needs more air to move the pellet.