WildCat MKIII Tuning Dilemma and Power Wheel Issues (***HELP***)

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eruiz146

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May 14, 2020
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FL, United States
Hello AGN Family hope all is well and everyone is staying safe. I want to ask you guys a few questions regarding the tuning of my WildCat MK3

I’m trying to tune the rifle to shoot HN and slugs 217 .22 caliber at around 960 FPS. So far I’ve been able to accomplish this. I have added the 2.5 Plenum extension to the block as well as the additional smaller Plenum on the barrel site for more shot count. According to Newman from 910 air tuning told me this would help with extra shots. A also added the Huma transfer port as well.

My Dilemma:

Reg us currently set at 140 BAR

I also wanna be able to shoot in JSB 18.13 grain pellets at 900-920 FPS. My issue is that upon moving the power wheel to a lower power level 2/3 I can attain the 900-920 FPS but rifle becomes wildly inconsistent. Meaning it’ll shoot to two or three shots at 910, 905, 907 and then all of a sudden shoot three or four pallets at 888, 856 then jump back up again etc... Is this normal at those power levels? I have wasted an entire tin of 500 pellets and played with the hammer spring at each level but cannot get the rifle to do what I want it to do? As adjusting one level affects the other. Is what I’m trying to accomplish even possible?



Also sometimes at when at power 7 the most important setting for me when shooting the slugs the rifle will shoot consistently let’s says 960-965 but there is always one or two shot in a 30 shot string that will drop 20-25 FPS. Causing my ES and STD Dev to go out of whack. It’s driving me crazy. Would that indicate more hammer tension or less hammer tension is needed. Again thank you for your and advice and help as always.
 
nice to hear that you are experimenting with your WC MK3. Few questions.

1) what WC do,you have compact or sniper in .22 ?

2) what weight slugs do you shoot at 960 fps .a

3.) Consistency in speed is best when your rifle is tuned well. Now how did you tune your rifle at position 7 ?

4) for me the powerwheel could be a quick “ escape /solution “ when I would be out of my ammunition and had to,shoot other pellets or slugs and get a quick adjustment for them without destroying my tune but apart from that unlikely occasion it is useless for me anyway as your tune will always be “ out of tune” ....

5): What do you mean with “additional plenum on barrel side “ ?


 
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Ladwict,

My apologies that info would help.

Im shooting a .22cal MKIII Wildcat Compact

H&N Slug 217 .22 Cal 21GR

The additional plenum is the smaller one that 1.2 inch plenum. Newman from 910 said it this is added to manometer side of the air-tube instead of the block side it would increase shot count. Imagine adding a small piece to make the air tube bigger to hold more air thats all.


 
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Not trying to be a downer but you'll never get the consistency at the lower power because the regulator pressure is too high for that power and being the WC3 is only controlled by the HS not a valve adjuster or TP adjustment, it just won't be consistent at both. They should have went with a TP adjuster like on the Royale instead of the HS
 
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Here is a couple thoughts...

Sounds like the way you have it tuned has too much hammer tension. You can look at how JoeKool tunes his WC MKIII as this seems to be a simple and effective method and it all starts with dialing in at position 7/6 and then letting the lower positions fall where they may to ensure a proper setting. The tune information starts on page 3 https://www.airgunnation.com/topic/a-week-with-the-fx-wildcat-mkiii-sniper-25-accessories-mods-tune-accuracy/page/3/

If you haven't read this thread it has lots of good information and you should read through all of it.

Otherwise, wild swings in FPS randomly happening I believe is pointing to an issue with the regulator...

Others might chime in and confirm this as I am not an expert but learning my way everyday like most here...

Good luck. The MKIII is an impressive rifle.

Keep us updated as we all have something to learn from this.
 
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Ladwict,

My apologies that info would help.

Im shooting a .22cal MKIII Wildcat Compact

H&N Slug 217 .22 Cal 21GR

The additional plenum is the smaller one that 1.2 inch plenum. Newman from 910 said it this is added to manometer side of the air-tube instead of the block side it would increase shot count. Imagine adding a small piece to make the air tube bigger to hold more air thats all.

No problem. With this additional info we have a better idea what you are doing. I would give you the following advise to try and see if that makes you more happy..

1)switch the plenums. Small one in the back as additional plenum and bigger one as airtube addition 

2)put you reg on 150

3) with your dial on position 7 you start shooting over the chrono 2-3 shoots at the time and see if your speed increases when turning the hex key a quarter turn anti clockwise in between these 2-3 shots. ( when adjusting the hammer spring you set dial to correct position and then back to 7). When you do not notice any speed increase anymore when making these quarter turn increasements you have found the plateau of this setting. From this top speed you deduct 3-5 % and then you dial your speed back with the hammer spring adjustment hex key till you have reached that speed. This is where your rifle is about at its best tune. I believe from my experience that the speed you get in my proposal is a little lower than your 960 fps but I would just check first if you shoot nice groups at let’s say 925 fps or so. Well maybe too long story but I hope you understand what I mean and it will help you. With the tune I suggest you will probably get rid of the inconsistencies in seting 7. In lower powerwheel settings your inconsistencies will rise again because the powerwheel just lowers the hammerspring tension and that makes the rifle out of tune in a way as I explained in my first mail to you and dairyboy explained to you as well.

in case you try what I tell you I am interested to get feedback . Don’t forget you have “ just” a 500 mm barrel so do not compare your facts and figures with others posting re WC Sniper versions.
Click to expand...


 
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Just my thoughts... Someone mentioned this above, so I’ll just expand with my hypothesis. Wildcat MKIII Compact versus Sniper, what is the big main difference here? Barrel length and air-cylinder... For shooting slugs I’m thinking “barrel length” will be the more important one. So let’s focus in on that. Common knowledge a longer barrel has more runway for a projectile to build up velocity versus a shorter one. So, be acceptable of that fact, there will be a limit to what your 500mm barrel is capable of compared to what the 700mm will do.


Awesome you’ve got your WC MKIII Compact slinging slugs at 960 fps with good performance and precision!! All you want now is to shoot JSB’ 18.13g at 910-920 fps, but it ain’t working well. Inconsistent..? I think your AMP regulator is too high. I would try 135 bar with no HST adjustments and on power #7 try (chronograph) the slugs. Then on power #2 or #3 try your pellets. [With the lower regulator pressure HST #4 may be the required setting for 910 to 920fps] Note your velocities and consistency? If that doesn’t get it try adjusting the AMP regulator to 130 bar and repeat? You may need more or even less HST at this point. It’s all a matter of balance. Especially when we try to change the factory tunes to one of our own. You have to find or almost recreate the sweet spot to match the new modifications you have made. You may have to sacrifice some top end speed (HST wheel #7) to achieve both usability with slugs on one setting and for lighter pellets on another. At least you know that the barrel shoots/likes the H&N slugs your using. It will probably shoot them well @ 920 to 940 just as accurately.


To put it short, I believe your regulator is set too high for good harmonic balance to shoot pellets at a “slower” velocity consistently. The point of plenum extensions is to eliminate the need for high regulator pressures. Try 135, 130, to 125 bar on your AMP regulator. Then tune your internal HST adjustment screw to max out your Compact’s velocity on power #7. It takes time but if you make small changes and test after the small changes, you may be able to walk it in to the point of satisfaction.



It’s hard to explain this through typed words, but I hope this is clear enough for you to understand. You have your WC Compact MKIII tuned to shoot hot, but asking it to slow down by just decreasing the hammer tension. And the airgun is confused. LOL! So, this is what points me to say dial that reg. pressure back and re-balance that hammer spring tension. All you’re doing is searching for that sweet spot, and right now you’re not there...



Shot count will likely improve with a lower AMP regulator setting, and that’s a plus!



JoeKool








 
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Thank guys for helping out. This community is full of amazing people! 

Joe thanks for taking the time to write those lengthy instructions. Very clear and easy to understand. I think I may be passing the sweet spot on HT as I get impatient at times and will do 1/2 turns on the hammer instead 1/4 or an 1/8 of a turn at a time. I didn’t think such a small adjustment would make a different. I will try some of the advice on this post and keep everyone posted on results. 
 
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Nice posting Joe . I believe that your advise would be very well applicable for a sniper version as the length of the barrel does allow for lower reg settings. The compact needs more of a short burst to function well to my experience hence a higher reg setting makes grouping better. Also speeds he requires are according to my experience unobtainable without being at the absolute limits ,even with the PP , with lower reg settings than 145. But the proof is in the eating of the pudding so let’s see what results eruiz146 will get if he is prepared to share his experiments with us. 




 
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Nice posting Joe . I believe that your advise would be very well applicable for a sniper version as the length of the barrel does allow for lower reg settings. The compact needs more of a short burst to function well to my experience hence a higher reg setting makes grouping better. Also speeds he requires are according to my experience unobtainable without being at the absolute limits ,even with the PP , with lower reg settings than 145. But the proof is in the eating of the pudding so let’s see what results eruiz146 will get if he is prepared to share his experiments with us. 



Click to expand...


Good point. You could very well be right, great input!




 
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Alright guys in the middle of this process. However I’m still struggling. My apologies for my ignorance but I’m rather new to this and learning. I followed Joes instructions step by step. The issue I’m having now is inconsistency with the speeds on pwr 7. 


After reducing the reg to 135 bar my speeds are fluctuating a little bit. I’m going quarter turns clockwise on Hammer tension but after a couple of shots the speed will increase when shot then decrease quite a bit. Shot one the speed will spike, Shot two will drop 12 FPS, shot three will stay around the same, shot 4 another spike etc... Is this to much HST or to little. I believe to little or to much can cause inconsistencies and this my frustration LOL. I would imagine I have to reduce tension since I reduced reg speed. However I’m still right around the 960 FPS or so I was before when reg was set at 140 bar instead of the 135bar. Only have 150 slugs left gotta make it happen! Rrrrrrrrrrrrr thank you gentlemen 
 
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