Setting the regulator & hammer spring tension correctly

Chuck said, " I caution you to not to try to turn something into something it is not capable of being. "

I agree 100%! Accept the gun for what it is, work to its maximum capability, but don't push it any further. I have a Marauder and with some coaxing and JSB exact heavies, can shoot very well at 75 yards. Under 2 inch groups, usually 1.5 inches. That's the best I'll ever get out of the gun because that's the best it'll do. I have to accept that. If I want more accuracy, such as 1 inch groups at 100 yards, that takes a different gun made to different standards. I want more accuracy, but it'll take a different gun. Best to accept what the gun will give and be happy with it!

Accuracy is a fleeting thing. There are just so many variables and you can only control a few. Some you just need to accept.

Good luck,

Thanks Chuck and Saltlake58 for your comments and recommendations.

Be sure everything will be taken into consideration. Regarding Wildcat, I have tons of small things I can do before going further with a new regulator. However, with the info many posted I starting to think mine is not bad at all. I understand the limitations of the Wildcat .22 and the limitations of JSB 18.13 grains BC. Best groupings so far are 3/8" at 50m and 1-1/4in at 100m (110 yards). I am starting to think these are the limitations in my gun. I should work too in my limitations including, but not limited to, accepting things I cannot change!

I have a Impact too. It came in .22 and I am still waiting a .25 barrel kit. Better BC, adjustable rifle and I hope to increase my performance at longer distances. It will be a new road. I am not planning to get rid of my Wildcat. I love the design, weight and she suits me well for small game at max 50/60m. 

Thank you guys for your time spent in commenting my post. Good shooting to all. 

Great info thanks for posting. 

Chuck,

Thank you for the indepth explanation on the hammer spring adjustment! I've spent an insane amount of time on the net trying to learn how best to tune my Coyote (Huma regulator install) and Gauntlet (bump up the regulator PSI to achieve higher muzzle FPS). It's been very frustrating on the lack of detailed (or maybe readily mined) information out there on hammer spring tuning.

Adjusting the Coyote/Huma regulator is relatively simple; the Gauntlet regulator requires more than just turning a screw but is also not overly difficult. The information challenge has been the best method to adjust the hammer spring, and avoid the problem of "bounce back". 

I also have learned a tremendous amount on this site and from chuck 
Thanks CHUCK and AGN

@paio I have a .22 Royale and your accuracy is pretty consistent with what I see from my rifle. I have to keep on reminding myself that I CANNOT compare it with what guys with .25 calibers can do. 

But in the distances I normally shoot in my yard (up to 60-65 yards) the .22 does reasonably well.

it is also pretty sensitive to a dirty barrel. The most I can shoot before pulling a dry patch is 150 to 200 pellets.

The bottom two groups are about as good as it gets for me with full mag groups (12 shots).

"mcoulter"@paio I have a .22 Royale and your accuracy is pretty consistent with what I see from my rifle. I have to keep on reminding myself that I CANNOT compare it with what guys with .25 calibers can do. 
But in the distances I normally shoot in my yard (up to 60-65 yards) the .22 does reasonably well.
it is also pretty sensitive to a dirty barrel. The most I can shoot before pulling a dry patch is 150 to 200 pellets.
The bottom two groups is about as good as it gets for me with full mag groups (12 shots).

Click to expand...

Those are awesome full mag groups!! Nice work.

Hey chuck thanks for the time you spent making this informative post. I have a question on something. I have a marauder gen2 .177 I installed a huma regulator in it and put in a lighter spring. Now when tuning this gun what do you suggest to do with the velocity screw and hammer stroke. If i am reading this all right and understanding I would need to open the velocity screw all the say 4 1/2 turns so there is no restriction on the airflow. Now I am not understanding what I need to do with the hammer throw screw does it need to be backed all the way out so there is full throw or does the throw need to be shortened. I have been messing with it for a week now and can not get the velocity to be consistent. going by what you say here to be the optimal setting I can not add enough spring to the gun to get it to ever start dropping off. Example today running the spring preload in on the marauder you can only go around 7 turns so i started all the way out and went one turn at a time. Here was my results.

Turns in - Velocity
1-719
2-750
3-778
4-865
5-875
6-885
7-920
8-920

I had the hammer throw set at 6 1/2 turns in and set the hammer spring at 7 turns in here is the results I had.

Created: 04-17-2018 05:39:07 PM
Description: HS 7 HT 6 1/2 light spring regulator
Notes 1:
Notes 2:
Distance to Chrono (FT): 0.00
Ballistic Coefficient: 1.000
Bullet Weight (gr): 0.000
Altitude (FT): 0.0
Temp: 71 °F
BP: 30.30 inHG
Shots
# FPS FT-LBS PF
101 837 0.00 0.00
100 845 0.00 0.00
99 847 0.00 0.00
98 849 0.00 0.00
97 845 0.00 0.00
96 847 0.00 0.00
95 852 0.00 0.00
94 852 0.00 0.00
93 856 0.00 0.00
92 855 0.00 0.00
91 855 0.00 0.00
90 ERROR 3
89 ERROR 3
88 837 0.00 0.00
87 ERROR 3
86 893 0.00 0.00
85 849 0.00 0.00
84 894 0.00 0.00
83 886 0.00 0.00
82 894 0.00 0.00
81 888 0.00 0.00
80 893 0.00 0.00
79 891 0.00 0.00
78 893 0.00 0.00
77 852 0.00 0.00
76 899 0.00 0.00
75 886 0.00 0.00
74 896 0.00 0.00
73 899 0.00 0.00
72 907 0.00 0.00
71 897 0.00 0.00
70 897 0.00 0.00
69 899 0.00 0.00
68 897 0.00 0.00
67 900 0.00 0.00
66 907 0.00 0.00
65 848 0.00 0.00
64 909 0.00 0.00
63 895 0.00 0.00
62 899 0.00 0.00
61 854 0.00 0.00
60 896 0.00 0.00
59 853 0.00 0.00
58 861 0.00 0.00
57 858 0.00 0.00
56 853 0.00 0.00
55 906 0.00 0.00
54 905 0.00 0.00
53 903 0.00 0.00
52 894 0.00 0.00
51 905 0.00 0.00
50 904 0.00 0.00
49 902 0.00 0.00
48 896 0.00 0.00
47 897 0.00 0.00
46 904 0.00 0.00
45 899 0.00 0.00
44 897 0.00 0.00
43 896 0.00 0.00
42 886 0.00 0.00
41 904 0.00 0.00
40 892 0.00 0.00
39 891 0.00 0.00
38 855 0.00 0.00
37 904 0.00 0.00
36 902 0.00 0.00
35 851 0.00 0.00
34 843 0.00 0.00
33 895 0.00 0.00
32 897 0.00 0.00
31 890 0.00 0.00
30 909 0.00 0.00
29 887 0.00 0.00
28 898 0.00 0.00
27 900 0.00 0.00
26 889 0.00 0.00
25 896 0.00 0.00
24 889 0.00 0.00
23 862 0.00 0.00
22 859 0.00 0.00
21 893 0.00 0.00
20 843 0.00 0.00
19 851 0.00 0.00
18 883 0.00 0.00
17 883 0.00 0.00
16 904 0.00 0.00
15 902 0.00 0.00
14 896 0.00 0.00
13 898 0.00 0.00
12 901 0.00 0.00
11 895 0.00 0.00
10 894 0.00 0.00
9 906 0.00 0.00
8 898 0.00 0.00
7 895 0.00 0.00
6 892 0.00 0.00
5 892 0.00 0.00
4 894 0.00 0.00
3 912 0.00 0.00
2 891 0.00 0.00
1 895 0.00 0.00
Average: 884.13
StdDev: 21.67
Min: 837
Max: 912
Spread: 75
True MV: 884.13
Shots/sec: 0.05
Group Size (IN): 0.00

Why is it going so low at times then back up I am just not understanding what is going on with this thing unless I got a bad regulator. Before the regulator it was getting around a 15 ES with very consistent shot string. I put the regulator in because I wanted to get rid of the bell curve and have a flat string. Any help you could provide I would very much appreciate.

When you put your Huma in did you get any power difference between the FX one and the Huma Chuck?

Hi Chuck,

When it comes to a gun like the Impact or Crown, how do you adjust your hammer spring tension? Do you dial to MIN then work up from there? Do you back out the fine adjust screw all the way out? I have that screw set to the FX spec of an 18,00 mm gap for .25 on MAX. 
I have found through trial and error that my spring, set to, MAX will NOT give me a slower or faster first shot. They are all in the same range. So, would I set to MAX then just bring the regulator up to my desired speed?

KP

"CHUCK"Sorry I don't know anything about the impact or crown rifles... My best advice would be for you to call Ernest Rowe at fxusa in North Carolina and get his opinion

Click to expand...

For the impact and crown, you want to adjust the hammer so that it gives you maximum fps on Max. You'd want to have your valve/transfer port all the way open while trying to achieve this. The hammer tension is a direct relation with the regulator pressure. Your being at 18mm seems very loose for a .25 and what reg pressure it requires to get it to speed. This is how myself and many top tuners I've spoken with tune our rifles with great results. Hope this helps. If you need more assistance, feel free to ask.

Eliteairgunr,
Sorry for the late response to your note. Thanks by the way!
I set the hammer spring fine adjust screw to 18mm in accordance to the FX spec for the .25 Impact. I decided to set it to that setting as a start reference. I totally get what Chuck wrote at the top of this thread so I will go back now with his and your info and fine tune the balance between spring and reg. Right now I’m at 120 bar and max spring at 18 mm giving me 845 fps and also giving me very good groups at 75 yd. I will document my current settings and start the fine tune. Thanks to to both for very good information. Cheers. KP

Thanks, thanks, thanks!! Finally I understand the relationship between hammer spring en regulator and how to set them to shoot my pellet at the right speed. I have a stock FX Crown in .25 with the reg at 125bar and shoot the JSB 25.39 gr at 274.9 m/s / 901,8 f/s. The rifle shoots quite accurate but outside @ 100M the groups aren't as tight as I know this rifle can. I would like to shoot the MKII's because the seem to be more accurate at longer distances. At the moment they shoot at a speed of 250 m/s / 820,7 f/s. I read on the internet that that is a bit to slow? They are quite accurate with this speed but I know than can be more accurate. 

This is at the shooting range @ 100M outside with the MKII's @ 250 M/s. 



Kind regards

Jos

Jos, for the 33.95's I recommend a regulator set point of at least 145 +/- 5~ bar if you want to bring up their speed...850~ fps may help them shoot better at that setting. GL

CHUCK --=--

I agree with everyone in this thread, you have contributed an enormous amount of information to the air gun community. Easy to understand using every day language. I thank you profusely for your educating me and many others in our sport. You are a rock star.

Have a wonderful Holiday Season CHUCK!