Tuning Another Maverick question

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Patrick1

Patrick1

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Jan 4, 2021
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Germantown, Tennessee, United States
I’ve asked this before in a different way-
Why can’t I get more consistent string on my shots. Wide spreads on the shots usually caused by 1 or 2 high or low velocities. The gun is compact, 500mm, .22. 1st reg at 130, 2nd at 105. Shooting FX15.89 pellets. PW set at 4 and ihs at about 3 turns ( I’ve varied the ihs only slightly 1/8 turns). Got maybe 4000 shots thru it.
Here are just 3 examples/strings-
6D04C677-D6ED-4EFF-A28C-725B31CD3123.jpeg
4592B806-C11E-4CBD-BC3E-F5C991667699.jpeg

Why would I get 1 or 2 random shots, 30 or more fps from the average. I want to go out to greater distances but I know my accuracy will suffer. At 25 I’m inside of a quarter inch most of the time. If it’s ever more than 1/2 inch it’s my “error”.
Help!!
I have looked and polished the sear, the idea of a hammer that might have a nick in it, I’ve gone up and down on pressure of 2nd reg and varied the hs til I am blue in the face. I must be doing something wrong soooo……
I would appreciate a few things to try from more knowledgeable folks on this board.

0E5396D7-3E40-41E5-AB0C-00D73CE97EF9.jpeg
 
Patrick1 said:
I’ve asked this before in a different way-
Why can’t I get more consistent string on my shots. Wide spreads on the shots usually caused by 1 or 2 high or low velocities. The gun is compact, 500mm, .22. 1st reg at 130, 2nd at 105. Shooting FX15.89 pellets. PW set at 4 and ihs at about 3 turns ( I’ve varied the ihs only slightly 1/8 turns). Got maybe 4000 shots thru it.
Here are just 3 examples/strings-View attachment 313904View attachment 313903
Why would I get 1 or 2 random shots, 30 or more fps from the average. I want to go out to greater distances but I know my accuracy will suffer. At 25 I’m inside of a quarter inch most of the time. If it’s ever more than 1/2 inch it’s my “error”.
Help!!
I have looked and polished the sear, the idea of a hammer that might have a nick in it, I’ve gone up and down on pressure of 2nd reg and varied the hs til I am blue in the face. I must be doing something wrong soooo……
I would appreciate a few things to try from more knowledgeable folks on this board.

View attachment 313902
Click to expand...
for starts = do you know that the crazy numbers were from a "good" pellet? damaged skirts or too large a head etc... can cause variation. I think Dougar might be of help here.
 
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Have you tried raising your regs and lowering your hammer spring settings? 130/105 is pretty low and maybe your regs are struggling a bit or allowing your hammer to over extend the valve. From what I have read the compact barrel does better with higher reg pressures and a "sharp" valve movement due to the lower expansion space available in the bore. Transparency I dont own an FX.
 
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I didn’t weigh or sort the pellets, if that is the question. I do look at skirts while loading into the mag.
FX seems to have, generally, a little bit better QC than their JSB cousins, to me. Fewer seem to be damaged…… to me.
cavedweller said:
for starts = do you know that the crazy numbers were from a "good" pellet? damaged skirts or too large a head etc... can cause variation. I think Dougar might be of help here.
Click to expand...
I didn’t weigh or sort the pellets, if that is the question. I do look at skirts while loading into the mag.
FX seems to have, generally, a little bit better QC than their JSB cousins, to me. Fewer seem to be damaged…… to me.
 
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MongooseV8 said:
Have you tried raising your regs and lowering your hammer spring settings? 130/105 is pretty low and maybe your regs are struggling a bit or allowing your hammer to over extend the valve. From what I have read the compact barrel does better with higher reg pressures and a "sharp" valve movement due to the lower expansion space available in the bore. Transparency I dont own an FX.
Click to expand...
I haven’t tried lowering cuz the pellet weight is so low. I started with 105/75 bar and went up just as you suggest. Worth a try as I was trying to balance heavier spring tension with higher pressure.
 
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Airgunmann said:
Did they both occur towards the end of the shot string or 870 towards the beginning and 919 towards the end ? If so I would try a little more hammer spring . If it occurred like I stated it would be because of psi difference
Click to expand...
I was trying to crank the ihs out a bit to get tighter spreads. Maybe, I didn’t go far enuf???
 
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dens228 said:
I just went though a tuning of my 25 maverick from scratch. Once I got the speeds I was looking for I fine tuned with little turns of the micro adjustment of the hammer spring. Trying both ways in little increments.
Click to expand...
Thanks for the reply. I was doing the same thing but I keep getting 1 or 2 very high or very low shots every grouping. Maybe I didn’t go far enuf????
 
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I checked on the shots as I was adjusting the ihs (out) and th first was the “shot spread 44” was done first, the “870” was done second and the last one done was the 919 string. The 919 was tha last shot.
The “shotspread 44”had 2 low shots (870, 868) and a 912 early in the string.
Should I just keep turning the ihs out?
 
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Turning the "ihs" is the same as turning the hammer adjustment but in finer increments. In my opinion the gun has too much hammer and getting the consistent speeds desired with lighter pellets is difficult with the large amount of hammer free flight which I think gives inconsistent hammer strike. I had the same trouble wanting a 25 600mm to shoot Hades at 880ish, removed the hammer weight and replaced with a plastic replica at about 2 grams and installed a heavier valve spring and got the desired speed and consistency with 90 or so bar on the reg. Hammer on setting 6, ihs - no idea where it's at. Or turn up the reg which will need more hammer giving less free flight to actually slow the pellet speed, but when you get below reg setting the speeds will increase tremendously.
 
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Let’s start with this. Remove the rear power wheel, and remove the spring and hammer assembly. Inspect for gouging on the back of the power wheel, broken hammer oring, or burrs on the hammer. Then inspect the cavity the hammer sits in. Make sure there is no burrs. These were known to have power wheel issues and gouging that could cause what you’re seeing. At least rule that out first. Then we can look at your tune.
 
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jphef said:
Turning the "ihs" is the same as turning the hammer adjustment but in finer increments. In my opinion the gun has too much hammer and getting the consistent speeds desired with lighter pellets is difficult with the large amount of hammer free flight which I think gives inconsistent hammer strike. I had the same trouble wanting a 25 600mm to shoot Hades at 880ish, removed the hammer weight and replaced with a plastic replica at about 2 grams and installed a heavier valve spring and got the desired speed and consistency with 90 or so bar on the reg. Hammer on setting 6, ihs - no idea where it's at. Or turn up the reg which will need more hammer giving less free flight to actually slow the pellet speed, but when you get below reg setting the speeds will increase tremendously.
Click to expand...
Thanks so much for the input! I looked again at the YouTube video by Matt Dubber on Maverick tuning and he said much the same thing. I’m just now learning the hammer weight/hammer spring relationship as it pertains to the reg pressure. Gonna try some things this weekend! Again, thanks!!
 
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madeintheuk said:
Let’s start with this. Remove the rear power wheel, and remove the spring and hammer assembly. Inspect for gouging on the back of the power wheel, broken hammer oring, or burrs on the hammer. Then inspect the cavity the hammer sits in. Make sure there is no burrs. These were known to have power wheel issues and gouging that could cause what you’re seeing. At least rule that out first. Then we can look at your tune.
Click to expand...
Thanks for the suggestions! I previously looked at the hammer burrs and saw only a very, very small gouge which I polished away- polished the sear, too! I’ll do a complete re-visit to the burr issue. I don’t recall seeing a hammer oring but will check this out, too. The back of the power wheel is a little worn. How would that affect occasional fast or slow pellets?
Thanks for your help!! Greatly appreciated!!!!
 
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I have the Maverick vp .22 and my second reg is at 85 bar . It's shooting 18g pellets around 890 fps for now. When I tried 100 bar and tried to tune it for 25g pellets the speed was still climbing until it no longer cocked, max hammer, and was slower fps than with lower pressures tunes. Needs a heavier hammer for faster speeds at higher pressures imo. Might want to try a lower pressure and see if it gets more consistent .

This shot string was from tuning it today. So some of the low numbers are from hammer spring or pressure adjustment.

Shot count: 72
Low: 856
Hi: 891
Avg: 875
STD Dev: 7.3
Spread: 35.0

12/16/22 10:58:47 AM,879
12/16/22 10:59:02 AM,872
12/16/22 10:59:23 AM,884
12/16/22 10:59:38 AM,879
12/16/22 10:59:52 AM,863
12/16/22 11:00:23 AM,875
12/16/22 11:00:34 AM,865
12/16/22 11:00:49 AM,870
12/16/22 11:01:04 AM,877
12/16/22 11:08:32 AM,865
12/16/22 11:08:48 AM,870
12/16/22 11:09:22 AM,884
12/16/22 11:09:54 AM,877
12/16/22 11:10:37 AM,863
12/16/22 11:10:56 AM,879
12/16/22 11:11:44 AM,875
12/16/22 11:14:52 AM,861
12/16/22 11:15:09 AM,863
12/16/22 11:15:30 AM,865
12/16/22 11:16:00 AM,870
12/16/22 11:16:37 AM,879
12/16/22 11:16:56 AM,868
12/16/22 11:17:08 AM,879
12/16/22 11:17:22 AM,877
12/16/22 11:20:23 AM,877
12/16/22 11:20:46 AM,875
12/16/22 11:22:10 AM,875
12/16/22 11:22:49 AM,877
12/16/22 11:23:04 AM,879
12/16/22 11:23:21 AM,870
12/16/22 11:23:44 AM,875
12/16/22 11:24:47 AM,872
12/16/22 11:25:12 AM,872
12/16/22 11:25:39 AM,872
12/16/22 11:32:39 AM,863
12/16/22 11:33:20 AM,872
12/16/22 11:33:36 AM,856
12/16/22 11:34:14 AM,872
12/16/22 11:34:33 AM,868
12/16/22 11:34:50 AM,875
12/16/22 11:35:17 AM,877
12/16/22 11:35:45 AM,870
12/16/22 11:36:06 AM,868
12/16/22 11:36:21 AM,870
12/16/22 11:42:41 AM,875
12/16/22 11:43:21 AM,863
12/16/22 11:44:22 AM,877
12/16/22 11:45:48 AM,875
12/16/22 11:46:45 AM,872
12/16/22 11:47:28 AM,884
12/16/22 11:49:25 AM,875
12/16/22 11:49:54 AM,886
12/16/22 11:50:25 AM,875
12/16/22 11:56:11 AM,881
12/16/22 11:56:51 AM,875
12/16/22 11:58:09 AM,875
12/16/22 11:58:30 AM,879
12/16/22 11:59:15 AM,888
12/16/22 11:59:43 AM,881
12/16/22 12:00:12 PM,886
12/16/22 12:00:38 PM,875
12/16/22 12:01:13 PM,877
12/16/22 12:04:41 PM,877
12/16/22 12:05:21 PM,863
12/16/22 12:06:36 PM,865
12/16/22 12:07:16 PM,879
12/16/22 12:07:57 PM,881
12/16/22 12:08:47 PM,888
12/16/22 12:09:39 PM,888
12/16/22 12:10:15 PM,884
12/16/22 12:11:06 PM,884
12/16/22 12:11:45 PM,891

Sorry for the long post.
 
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