S400 Power Issues??????

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AlvianSkyKing
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Joined: Fri Mar 16, 2018 9:06 pm

S400 Power Issues??????

Fri Mar 16, 2018 9:15 pm

Hi all,

I'm new to this site so this is my first post. I'm after some advice really......

I own an S400 Carbine in .22. Recently I've noticed a few wayward shots and when shot my last squirrel, I hit it square in the head at around 15m yet the pellet hadn't even penetrated its skull (although thankfully, had killed it). I wondered if the rifle was down on power so I've completed a string of 90 shots to test the power.

Started at a 190 bar fill and measured the power of each shot and plotted on a graph along with the pressure every 10 shots.

The result:
The first 17 shots were slightly low on power. To be expected. No big difference on the target.
I then had around 25 ish shots at what seemed to be the maximum power range. No big difference on the target. However, the average power across these few shots was only 10.54 ft.lb using AA Diablo Field. The consistency range across the same shots was 8fps.
The remaining shots started to drop low on the target slightly at first, and that much more steeply as expected. However, the lower the power, the lower the pellet hit the target but also, the further right it hit the target.

So my questions are:
Is the power curve of my rifle ok or should I be looking to have it serviced to increase the power?
Is the pellet veering right as the power drops normal?

Thanks in advance for any advice.
Nath

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bgaltd
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Location: Somerset
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Re: S400 Power Issues??????

Sat Mar 17, 2018 5:26 pm

can you show us the shot string and ftlb so we can see the string please .

the drop to the right will be the winds affect on the slower pellet .

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tonyc
Posts: 376
Joined: Mon May 29, 2017 10:55 am

Re: S400 Power Issues??????

Sun Mar 18, 2018 3:48 pm

How old is the gun? What is the shot count when the power falls below the level achieved at 190 bar?
Is it down on power and giving more shots, or down on power and giving less shots than the AA spec?
If the gun is down on power because the firing valve is releasing less air (for example the spring has weakened) you might expect to more shots than you seem to be getting. If you are getting fewer shots than normal spec a possible cause is a leaky seal around the pellet probe.

If we could see the data it would help the diagnosis.

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AlvianSkyKing
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Joined: Fri Mar 16, 2018 9:06 pm

Re: S400 Power Issues??????

Sun Mar 18, 2018 7:26 pm

Hi all,

Thanks for your advice. I've attached an image to this message which hopefully you can see??? The below is the shot string with pressure read every ten shots.....

Shot No F.P.S Ft.lb Pressure Grain
1 539 10.32 190 16
2 543 10.48 16
3 542 10.44 16
4 538 10.29 16
5 540 10.36 16
6 541 10.40 16
7 540 10.36 16
8 544 10.52 16
9 543 10.48 16
10 543 10.48 175 16
11 541 10.40 16
12 540 10.36 16
13 543 10.48 16
14 539 10.32 16
15 541 10.40 16
16 541 10.40 16
17 543 10.48 16
18 549 10.71 16
19 548 10.67 16
20 541 10.40 150 16
21 541 10.40 16
22 544 10.52 16
23 549 10.71 16
24 544 10.52 16
25 544 10.52 16
26 543 10.48 16
27 544 10.52 16
28 548 10.67 16
29 548 10.67 16
30 549 10.71 140 16
31 543 10.48 16
32 542 10.44 16
33 542 10.44 16
34 544 10.52 16
35 548 10.67 16
36 549 10.71 16
37 548 10.67 16
38 541 10.40 16
39 547 10.63 16
40 549 10.71 125 16
41 540 10.36 16
42 540 10.36 16
43 543 10.48 16
44 543 10.48 16
45 541 10.40 16
46 543 10.48 16
47 543 10.48 16
48 537 10.25 16
49 540 10.36 16
50 539 10.32 110 16
51 543 10.48 16
52 540 10.36 16
53 538 10.29 16
54 537 10.25 16
55 539 10.32 16
56 541 10.40 16
57 533 10.10 16
58 538 10.29 16
59 538 10.29 16
60 539 10.32 105 16
61 533 10.10 16
62 530 9.98 16
63 532 10.06 16
64 530 9.98 16
65 532 10.06 16
66 527 9.87 16
67 528 9.91 16
68 531 10.02 16
69 522 9.68 16
70 522 9.68 100 16
71 528 9.91 16
72 523 9.72 16
73 527 9.87 16
74 521 9.65 16
75 522 9.68 16
76 522 9.68 16
77 522 9.68 16
78 517 9.50 16
79 520 9.61 16
80 519 9.57 95 16
81 517 9.50 16
82 514 9.39 16
83 510 9.24 16
84 507 9.13 16
85 509 9.21 16
86 507 9.13 16
87 504 9.03 16
88 500 8.88 16
89 501 8.92 16
90 497 8.78 85 16

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tonyc
Posts: 376
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Re: S400 Power Issues??????

Mon Mar 19, 2018 11:34 am

I don't have a .22 Carbine so I'm going by AA spec, but I would say you are down on power and number of shots. You might check to see if you are leaking air between firing valve and barrel - either the barrel seal or transfer port.

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AlvianSkyKing
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Joined: Fri Mar 16, 2018 9:06 pm

Re: S400 Power Issues??????

Mon Mar 19, 2018 12:53 pm

Thanks I'll check that out......

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bgaltd
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Re: S400 Power Issues??????

Wed Mar 21, 2018 10:07 am

it doesn't look to be shooting very efficiently:-( . a good clean , seals and springs change will sort out your wows .

if you feel confident enough to do it yourself i can sort out the parts for you , if not i or someone close to you can help with the servicing :-) .

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