Huma Regulator installed in the s510

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James if you look at the velocity of the strings you can see adding the shim didnt jump the velocity so that tells you with the stock hammer you are already on the plateau. So you are going the right direction by lightening it.

Are you using the 18 gr. jsb and getting 935 fps or the 16 gr.? Either way you have 30 fpe or 35 fpe so still within the power range you originally wanted. I would drop the weight of the hammer a little more so the average velocity is about 15 fps under the plateau of 935 fps. That will put you on the knee and keep the power where you wanted it with good efficiency. Good job so far and you are almost there;)
 
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Thanks to you mate !!! Otherwise, my rifle won't be where it is now ^^

I'm using the 16 grains but I'll change.. Here a copy of a post I published on FB that explains why:
"Do you think this choice of pellets might help ??
I've noticed a significant lost of accuracy in the last few weeks with my .22 FAC aa s510 that used to LOVE the 16 grains jsb.
Now that I've regulated it and obtain an extreme spread of 5 fps over 50 shots with an average velocity of 927 fps + a big service on the rifle O-rings, tightening all the screws well, barell cleaning etc etc.. I thought this problem might be fixed. Not at all. My groups at 50 are still twice the size they used to be, if not more.
So I decided to buy the 18 grains jsb. Heavier means more power, less velocity, more stability... I'm right no?
So.. Do you think I've made the right choice guys ?? =]"

Also, I've RE reduced the hammer weight. 38 grams now instead of 49. Lost 10 fps but.... Well shuffed with the results mate now ^^

Thank you soooo much for your help =)
 
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I sure will enjoy it mate !!
I've been stopped by the rain but here is the beginning of the last string:

#1 928 - 929 - 929 - 929 - 927 - 925 - 924 - 925 - 923 - 924

#2 923 - 927 - 924 - 924 - 921 - 923 - 923 - 922 - 927 - 927

=)
Now,I only have to sort the accuracy issues out, that's why I ordered the 18gr jsb instead of the 16gr..
Which pellets are you using in yours mate??
 
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So...
As I told you, I was shooting between 920 - 930 fps earlier today on a string of 44 shots. That was great. BUT, this evening after the rain and with a humidity of 92%, I decided to shoot long range and see if it wqas easier to touch the target and I noticed that the velocity had decreased of 10 fps and that I was now shooting between 910 and 920 fps with the exact same setting...
How do you explain that please? the reg breaking in? the humidity? maybe a little tiny drop of water in the reg as i fill the rifle with a handpump and that creates humidity, a lot.. Maybe something that is wrong? Maybe I should have kept the hammer at 40 grams... I'm a bit worried right now... =/
 
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Dont worry it could be just the change in temp and humidity. It could be the rifle settling also after working on it and putting it back together. If its consistent then dont worry. The hammer is the correct weight and its better in my opinion to have the lighter hammer and make it up in spring tension if needed instead of a heavier hammer. One thing I forgot to mention earlier about the weight of pellets and my experience. Both weights of JSB didnt perform at 900 fps and above in my rifle. I found that 870 or less gave me optimal performance with both. So I settled on 870 fps with the 16 gr. which gives me 845 fps with the 18 gr. JSB. I use the 18 gr. @ 845 fps out to 110 yds on ground squirrels with deadly results. The 18 gr. JSB @ 845 gives 28 fpe and in my opinion 2 fpe dont mean anything at fac power level. I would rather be able to put that pellet exactly where it needs @ 20 fpe than possible be slightly off @ 30+ fpe. Just my opinion but something for you to think about if you find the 18 gr still dont give the accuracy they should.
 
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Yes you're right mate... No big difference but the certainty to hit the target.
And even if it's a light decrease in the fps, I set a metal reactive target smaller than a hand size, at 150 yards to see if it was easier to hit it with strelok and the regged rifle...
And surprisingly, I hit it 7 times out of 10.. So I think the issue with the 16 grains is the speed... =]
 
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James hitting that consistently at 150 yds is great and I would say the accuracy is there. Adding a reg is one part of the equation and in order to get the utmost from the pcp you still have to find the best speed and pellet combo to get what you want. I didnt need much trial and error cause I already did it before it was regulated so I knew what to expect based on velocity. So all I needed to do was stay inside the window for best accuracy with my rifle and tune for my best shot count within my acceptable window. It adds to the fun and gives you a better understanding of how your rifle works and what it likes so I enjoyed it.
 
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Ok ok.... SO as I told you, I was a bit worried by the low velocities (I was getting between 900 and 910) and the increasing ES, After the hammer weight reduction I reached an ES of 30 fps on a single with velocities jumping from 890 to 920 fps. There was CLEARLY something wrong.
So I took everything apart even the reg which I set to 130 bars instead of 135. My guess was that, if I have less pressure applied on the valve with a lighter hammer, the valve will be opened few thousands of seconds more which will harmonise the system.
Apparently it seems to work as I'm now reaching the 925 - 935 fps as I was before. That might means less accuracy with the 16 grains, but as I'm gonna shoot with the 18 grains soon, I'll be in the 905 - 915 fps window which is where they seem to perform well.

I also noticed a lot of humidity on the reg. So I cleaned the inside of the cylinder and wipe off the humidity on the reg. Regreased everything, but not too much and I'm now refilling it.

Hopefully this will have fixed my problem. I'll keep you informed on how it goes !!
 
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Well... It hasn't changed anything.
Here is my last string:

#1 934 - 927 - 925 - 927 - 924 - 922 - 922 - 922 - 915 - 913

#2 / - 913 - 907 - 911 - 910 - 903 - 896 - 896 - 897 - 888

#3 896 - 927 - 897 - 906 - 908 - 911 - 894 - 892 - 890 - 862

#4 856 - 900 - 923 - / - 871 - 870 - 858 - 848 - 925 - 863

I think I should change the spring for a slightly stronger one or ask Huma to send me a new reg...
 
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If you are getting moisture in the rifle thats gonna cause some real problems. Also if you get to much grease in the reg it will also cause issues. So I would find a way to get dry air into the rifle. Did you take the reg apart? If you did you may have gotten something into it or got it back together incorrectly. You could also just be getting a sticking hammer. Make sure you polished the hammer guide and inside of the hammer where it rides on the hammer guide real good. Also if you greased the hammer guide you need to remove the grease. There are two thoughts on lubing the hammer in a regulated rifle. One thought is it causes inconsistency due to the grease not letting the hammer slide consistently. The other side says you can lube it but do so very sparingly with a light weight oil not grease. I used moly on mine and rubbed it in then wiped it down so there would be no excess left on it. My BSA S10 was all over the place because the previous owner heavily lubed the hammer with oil. Cleaned it up and it was acting as it should.
 
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The advice I followed with the hammer was to polish the rod the hammer slid on. The surface finish achieved with 1000 grit is quite rough. I used a car paint cutting compound, following by Autosol metal polish and a good clean afterwards to remove all residue. I thought about using a spray of silicon lube, but stuck with the general wisdom of one or two drops of light machine oil.
 
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A quick update guys !!

So I've received my JSB 18.1 grains and so far, the s510 is shooting flawlessly with them !!!
I'm having 45 regulated shots at an average speed of 900 fps and an ES of 12 fps which gives me 44 joules, just where I wanted the rifle to be.
I shot a group of 8 pellets at 50 yards with a slight breeze: 15 millimeters wide which is good but I know I can do better.
Yesterday I shot at my homemade steel reactive target at a disatance of 150 yards: 4 shots out of 4 hit it then I stepped down to 7 shots out of 12 again, with a bit of wind.
The reg + the chrony + the strelok app makes every single shot completely predictable which is great for hunting purpose (that I've already tested).

All in all, I think time and money spent in the installation and tuning are TOTALLY worth it, and I thank everyone who helped me out in this process especially you LDP for your wise comments and your time.

I'll try to shoot videos, put them on youtube, then share them here.
 
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Nice work James and glad you have finally got everything working like you want. It also sounds like you are getting good accuracy especially since the 8 shots are in a slight breeze. It doesnt take much to throw a shot slightly with shooter error and a slight breeze. Glad I could help and all worked out for you in the end. I look forward to the videos.
 
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