Daystate Huntsman Regal 25

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Dr. Kralenstein

Dr. Kralenstein

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Apr 14, 2022
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The Laboratory, United States
As some of you know, I purchased a regal off the classifieds to compliment my revere. This one is an unregulated 25 caliber.

My issue is, no matter how I tune the hammer strike, it has too much extreme spread over only 20 or so shots. Also has a 250 bar fill, but it's practically impossible to tune it for more shots at lower power without a huge spread 100 fps over 30 shots!

I almost gave up on it after wasting a couple hundred pellets. I posted it on ebay last not because I'm discouraged. I wanted to make a 20 shot 50 fpe rifle, which isn't what this gun will do. It'll do 44 fpe for around 15 shots and it jumps too much and accuracy goes to hell.

So I got to thinking. Why not just put a Huma reg in it? Not much money and I can get it set up for a nice mild shooting gun that'll still hunt out to 75 yards or so.

I will be ordering one shortly, but I was wanting ask some of you regulator tuners, what pressure should I set thus at? 17" barrel and would like 30+ shots on a fill of 250 bar/162cc. I'd like to see around 800 fps with 25.4s since that's about where it seems most accurate.

I'm thinking around 160 bar setting should get me there, but im not that familiar with reg settings.
 
I had a non regged Regal XL in .22 and the only thing I wish it had years ago was a REGULATOR....😂👍. These are not really designed for .25 high power but really a 30fpe .22. But, regulating your .25 would definitely be the way to go so your ES is non existent over the regulated pressure shots. These have very small plenums designed for .177-.22. Regulating yours might make it louder but worth it in my opinion, your mileage may vary. I hope you keep it and install a Huma! Keep us updated please! Fantastic guns!
 
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Ranchibi said:
I had a non regged Regal XL in .22 and the only thing I wish it had years ago was a REGULATOR....😂👍. These are not really designed for .25 high power but really a 30fpe .22. But, regulating your .25 would definitely be the way to go so your ES is non existent over the regulated pressure shots. These have very small plenums designed for .177-.22. Regulating yours might make it louder but worth it in my opinion, your mileage may vary. I hope you keep it and install a Huma! Keep us updated please! Fantastic guns!
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They offer one with a larger plenum, but the air volume is the issue at that point.
 
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I've messed around with my P35-25 trying to get it to 50 fpe and I got there last winter but now it didn't have hammer spring enough to open the regulator setting that worked in the winter. The hammer spring was an issue in the winter too. I had to set the regulator to the highest setting the hammer would open to get to ~800 fps with 33.95s. That took a lot of trial and error so at least for now it is set to shoot the 33.95s it likes at about 760 fps. The P35 barrel is 450mm long - so a bit longer - and it stores more air. I put a bigger plenum (about 35ccs) to get it to it's current power. My hammer spring will not support even a 150 bar regulator setting.

Quite a bit different gun so I don't know how useful this will be. My current inclination is to leave it at about 45 fpe to avoid the need for a seasonal retune. I have some hammer spring left at this point so I can adjust some without taking the gun apart to change the regulator. I've also searched for a stiffer hammer spring that would fit but was not successful.

I'd try a regulator setting of about 150 bar to start. Hopefully your hammer spring will open it. A dramatically low velocity is an indication it won't (the same setting that gave me about 800 in the winter produced about 600 fps in the summer).
 
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JimD said:
I've messed around with my P35-25 trying to get it to 50 fpe and I got there last winter but now it didn't have hammer spring enough to open the regulator setting that worked in the winter. The hammer spring was an issue in the winter too. I had to set the regulator to the highest setting the hammer would open to get to ~800 fps with 33.95s. That took a lot of trial and error so at least for now it is set to shoot the 33.95s it likes at about 760 fps. The P35 barrel is 450mm long - so a bit longer - and it stores more air. I put a bigger plenum (about 35ccs) to get it to it's current power. My hammer spring will not support even a 150 bar regulator setting.

Quite a bit different gun so I don't know how useful this will be. My current inclination is to leave it at about 45 fpe to avoid the need for a seasonal retune. I have some hammer spring left at this point so I can adjust some without taking the gun apart to change the regulator. I've also searched for a stiffer hammer spring that would fit but was not successful.

I'd try a regulator setting of about 150 bar to start. Hopefully your hammer spring will open it. A dramatically low velocity is an indication it won't (the same setting that gave me about 800 in the winter produced about 600 fps in the summer).
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I'm thinking 150-160, should net me a 35 fpe tune, which us fine for this rifle. The 22 revere reg is set at 140 from the factory and it's spitting 44 shots at 28 fpe.
 
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I am thinking your hammer spring will probably not be the limitation it has been for me with my P35. If it will open the valve with the air chamber at 200-250 bar, it should open it with any reasonably pressure in the plenum - presumably as high if you wanted to go there.

So that would make it more a question of balancing regulator setting/power versus shot count. You can probably get to 50 fpe but the shot count may be too low. It is not all the regulator, of course. I gained some fps on my P35 drilling out the air passage from the valve to the barrel. My guess is your daystate is a bit like my SPA in being designed to be a 22 (or possibly even a 177) but also offered in 25. Airflow at 25 may be low with smaller passages through the gun and even valve size. I know my Caiman has a lot bigger valve and passages even though it is only a 22.

Anyway I doubt you will have a problem getting to 35 fpe. My guess is low 40s will be possible with a shot count not too different from your 22. I had my P35-22 and P35-25 both at 32 fpe last year and the shot count on the 25 was at least 10 shots greater.
 
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I took it out for some groups. God these mosquitos are NON STOP. Off doesn't stop them either.

I used the single shot tray this time, and I can pretty much one hole 25.4 jsb, air arms, and the jts dead center domes. Even the 33.95s one hole, just a half inch low at 30.

If I fill to 220 bar, it is about 1/2" low for the first 4 shots, and then it's on til about 150 bar/30 shots and starts to drop. I used the huggett belita off of my revere and it shoots lights out just like the Koi. For some reason the factory mod that it came with was causing grouping issues.

My new to me Prod is now wearing that and it's so quiet it would make a flatulent mouse jealous.
 
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JimD said:
I am thinking your hammer spring will probably not be the limitation it has been for me with my P35. If it will open the valve with the air chamber at 200-250 bar, it should open it with any reasonably pressure in the plenum - presumably as high if you wanted to go there.

So that would make it more a question of balancing regulator setting/power versus shot count. You can probably get to 50 fpe but the shot count may be too low. It is not all the regulator, of course. I gained some fps on my P35 drilling out the air passage from the valve to the barrel. My guess is your daystate is a bit like my SPA in being designed to be a 22 (or possibly even a 177) but also offered in 25. Airflow at 25 may be low with smaller passages through the gun and even valve size. I know my Caiman has a lot bigger valve and passages even though it is only a 22.

Anyway I doubt you will have a problem getting to 35 fpe. My guess is low 40s will be possible with a shot count not too different from your 22. I had my P35-22 and P35-25 both at 32 fpe last year and the shot count on the 25 was at least 10 shots greater.
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It does seem that they built these with 177 or 22 in mind. It is a UK gun after all. 12 fpe limit there. A 12 fpe 25 is funny. I think you could throw a 25 cal pellet harder!

I will get the reg from Matt and try and tune it. After getting some shots outside with the lower power tune, it's usable. It's smooth as butter now. I won't be able to push distance until I have a solid tune though. A 50 fps spread is a bit much on a 25 cal. I can always hold over I guess.
 
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I agree 50 fps can be challenging, especially for a really nice rifle. My Prod is tuned to about 18 fpe and I have to tolerate about a 40 fps spread to get 20 good shots at that power. I shot a 30 yard challenge target or two with it but had to adjust my aim a little due to the velocity spread (I think I shot a 194). But you know what it's going to do. I don't know how hard it is to change on the huntsman but my guess is opening up the transfer port, the barrel port and possibly the passage between the valve and the barrel would help your unregulated gun tolerate higher fill pressures. That is what I found on my little Prod. It like 2500 fills with the factory tune but with a bigger transfer port it likes full 3000 psi fills. I took it to 20 fpe but the shot count was less than a magazine so I dropped it a bit. But I would not open them up if you are putting on a regulator. I think it will increase your ES. If it has a replaceable transfer port you might try a bigger one, however. You could then return it to stock as a starting point with the regulator. The transfer port is the choke point of the Prod. If you can open it up I am pretty sure you can make at least as much power with the unregulated gun but you won't have as low a ES or as many shots at a low ES.
 
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Couple quick picks of the regal and revere. Very cool how the stocks each have their own look to them. It's like each one of these huntsmans have their own character. I haven't seen 2 that looks the same in the stock department. The butt pads are different, the palm cap is different, the pad spacer is a different wood too. The grains and stains are different. The overall shape is the same and stipling design, but it's nice to have each one be so unique to the other.


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Regulating a .22 Huntsman Regal - my recent experience.

My Regal is one of the last ones made - even had the regulator venting slits cut in the threading - even though it was unregulated new.

I’ve had this Huma with large plenum in and out of the rifle at least 6 times this year. I’ve tuned and target shot with velocities as low as 720fps with JSB 15.89s to 895fps with 15.89s. Velocity setting is easy via the length of hammer throw adjustment on rifles with Slingshot Hammer. I’m not sure if the .25 caliber uses the slingshot hammer system. (.177 and .22 do)

Daystate themselves state that you will get 39 shots on regulator (picture is from their website last week).

When I was tuning, I could get about 35-37 shots on the regulator at 29 ft/lbs. I was able to get 75-80 shots with my mildest tune (I think 19 ft/lbs).

I tried 140, 150, 160 and 163 reg pressures. My experience is that you will want to set your reg at least at 160bar - perhaps 170bar for best tune. Daystate uses a very small transfer port size, perhaps that is why Daystates typically have high reg pressures from the factory. Perhaps your .25 will have a larger transfer port size than the .22, which will help.

I may install reg again and tune for 50 shots - but my experience is that will be around 23-24 ft/lbs. I can get 40-45 shots unregulated at a higher power level (29-30 ft/lbs) - and PoI doesn’t change much throughout unregulated shot string - and I’m shooting at a 1/8” 10-ring at 30 yards…

… so, the benefit of the regulator in .22 is marginal - its a bit of a trade off with power.

-Ed

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