Huma in the WC177

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Crusher

Crusher

Member
Mar 6, 2018
1,418
61
Irving Texas, United States
Finally got things tuned in the WC 177. The Huma is very stable and did give me a slight increase in shots, even on the 177.
Take a look at the middle of this 98 shot string. Pretty impressive I'd say. Especially since these are non-sorted pellets. Just straight from the tin.

Crusher

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I'm impressed! You certainly know your way around the Wildcat. Since I have got you here reading this post ... do you mind if I ask you a dumb question. My Wildcat in .25 cal had just taken a nose dive on the accuracy part. I ran it across the chronograph and got a Hi of 883 ... a Lo of 815 ... Avg of 839 ... ES of 68 and SD of 14. I don't know what happened as I have not shot it very much since the extremely cold weather in January. I'm thinking that it is probably the hammer spring that has loosened up or the regulator that has gone south ... it's not losing any air that I can detect. Prior to January it was shooting anywhere between 895 to 880 and would drive tacks almost all day long. I've only been in PCPs about 2 years with most of that time playing around with Marauders. Thankfully the gun is still under warranty so I know I can send it to FX USA in Wilmington but the gun is only about 6 months old at the most. Do you know if the hammer spring would cause that much deviation on the shot spread? I haven't taken it out of the stock yet because I read somewhere on this forum that the screw that you use to adjust the HS is somewhat fragile and easily marred even if you use heat to break the Loctite. If you have any tips that can point me in the right direction, I sure would appreciate it. 
 
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Hi Crusher,
Wow! That is a beautiful shot string! You couldn't ask for better than that! It is the beauty of the Huma Regulators...once you get them set up and they settle in to a certain setting, they will keep that setting over time so that you can count on your rifle shooting exactly the same way each and every time you use it. With out having to worry about regulator failures and the drastic fluctuations in velocity that accompany them. I think you have done a remarkable job of tuning your Wildcat .177...and an added benefit is that now you know your rifle inside and out and never have to worry about sending out to someone to fix for you. That in itself is a great feeling...congratulations my friend. And now you can share with others here the benefit of your knowledge and experience. 
All the best, Chuck
 
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Thanks Chuck. You had a part in my recent experience with the Wildcat. I love to take things apart and figure out how/why they work. And installing this huma reg gave me a really good schooling in Wildcat anatomy and patience. :) Thanks for all the emails back and forth answering questions and offering advice.

And thanks to Centercut as well. I appreciate the helpful input and the encouragement. You da Man!

So, likkitysplyt:
I'd be willing to bet your regulator is toast. That is exactly what happened to my 25 at about 3 months in. Huge ES and shots everywhere. I would recommend you send it back to FX (yeah I know, you won't see it for a while). But it is still under warranty.
Before you send it, I might just want to settle something in my mind first. Have you cleaned the barrel since you got it? I know mine trashes up pretty quickly and causes inaccuracy and fliers. But for the big ES, I bet regulator. Highly inconsistent velocities will give you changes in POI, which it sounds like you are experiencing. So still betting regulator. 
As for the hammer spring, I haven't heard anything at all about the spring "going bad" or anything like that. My money is on the reg.

And if you don't care about sending it in to be fixed, and you would rather do something different, Then let me recommend replacing the reg with a Huma. I am fairly new to the Huma myself having just installed this one in my WC 177. However, I can tell it is very much different than the stock one. I mean, just look at that string.

That being said, if you have Marauders and have no fear taking out the valve assembly, then changing out the reg should be a piece of cake for you. There is a little bit of a learning curve but if you can handle the Marauder, you can handle the Wildcat. Granted, there are a few little tricks to getting it set up right. But it was a whole lot of fun for me. :)
And if you don't feel confident doing it yourself, there are a couple of guys right here in these forums that will work something out with you. Just ask. (and to the repair guy, you know who you are, maybe pm this guy?)

And if you want to send it to someone who works for FX, then maybe send it to Ernst Rowe. He is "the master" FX tuner.

Hope that helps

Crusher
 
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Yeah ... Thanks for the feedback Crusher. Actually that shot string I did with the chronograph was a lot worse than I put down in my post. I'm kinda having a hard time coming to grips with this much deviation from what the gun was doing before and what it is doing now. Truth is the hi was 883, lo 595, avg 839, es 288, sd was 36 ... I mean I actually thought my chronograph was broken ... so I took the craziest numbers out ... the ones that I thought couldn't possible be correct ... but thinking back on it, they were probably spot on. The last time I shot it, it was dead on at 60 yards with the JSB 25.4 grain and giving close to .50" groups at that range. Now I am having to shoot 20 mill dots over the target and about 6 inches to the left ... and even with that it is hardly grouping in 4 inches at 60 yards ... actually, not even what you would call a group, more like a scatter gun pattern from a sawed off smooth bore. And yes, I have cleaned the barrel pretty regularly after about every 200 to 250 shots.

​I have an Impact down at FX USA that Ernest is working on now. It started leaking air under the trigger guard where the regulator adjustment is and as it was under warranty also I just sent it in and Ernest said he would tune it for a very reasonable price ... plus fixing the parts under warranty.

​Ya know, since the WC is sill under warranty, I might just email Ernest and ask him if I bought a Huma regulator for the WC and sent it in with the gun to FX USA, if he would install it and tune it while he has it down there. I mean, he is gonna have to take the old regulator out and adjust a new one anyway ... and I'm sure he knows all about Humas ... so it would be kinds dumb for me to void the warranty playing around in there for the first time.

​I was kinda hoping that it might be something trivial like the HS working it's way out, but I think I have something a little more wrong than that going on here. Heck, I'm pretty sure I could pull that regulator out and shoot unregulated and come out with a lot better es than what I am getting now.

If you don't mind me asking, where did you buy your Huma from?
 
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Likkitysplyt, it could be the reg, but that sounds like it’s more than a bad reg. An ES of 50 or so would indicate a bad reg, but what you’re seeing appears to be a loose barrel or something where the transfer or probe ports are moving around. I wouldn’t jump on a Huma so fast. Send it to Ernest at FX, since it’s under warranty that’s the smartest thing with what you’re seeing. 
 
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When my WC was acting up what I thought was really bad, it had an ES of like 60. Wow, that is really something. Yes if you already have a relationship with Ernest, I would send it to him. As Centercut said, I would just let him install a new stock reg. That would be free since it is still under warranty. (the reg I mean).

i sent my 25 in to AOA back then and they installed a stock reg and it is still shooting just fine. I was going to put a Huma reg in it as well, but I'm waiting for a reason to go inside the gun. So far, she has not given me cause. Here is what the 25 is shooting like after I tuned it down a little from the 900's it was shooting. Stock reg, unsorted pellets. And this is the middle of a 60 shot string, just intended to show what the stock reg is capable of. 
Crusher
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You guys are great and I really appreciate all the help ...
Yes Steppenwolf, I checked the breach o-ring and it is looking good and anyway the gun would sound like a shotgun if the breach o-ring was tore up or missing ... even with a DonnyFl Sumo on it. 
I pulled it out of the stock and checked the hammer spring adjustment ... it hasn't backed out.
Chuck, I checked on AOA and they are advertising Humas for the .25 Wildcat for $115 which is probably pretty reasonable. I agree, the adjustability of the Huma regulator and ease of installation and adjustment are important. The pellet probe feels and looks excellent, no wiggle in there at all as it feeds into the breach. I have never removed the barrel on this gun, but it does not appear to be loose. I was reading on this forum about how if the barrel is not placed exactly in the right spot it can partially cut off the transfer port not allowing air to flow freely so it probably would not have to be off much ... but I really don't want to have to strip down the WC just right now. I'm gonna take advantage of the warranty while I still have it and try to get Ernest to work a little miracle for me. There will surely be enough time to go into it in the future as I suspect that this will not be the last time I have trouble with one of my airguns.
​Crusher, that shot string looks very close to what I was getting from this gun when it was new with an ES of about 15 fps and it was lights out accurate out to about 125 yards. This regulator has always had some creep in it because the first few shots would always be low in velocity, but usually by the third shot it would straighten out and drop the rest of them in the normal range.
​Again, thanks for all the help and advice, it's great to be able to bounce some ideas off the wall with some people who have more experience with the Wildcat than I do ... it really helps.
 
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"CHUCK"Hi Crusher,
I am curious to know what size plenum ring you used and what your Huma regulator pressure setting is at to accomplish that most excellent shot string? And I am wondering if maybe you could install a Huma reg for Likkity and tune up his Wildcat for him? Because at this point brother Ernest himself couldn't do a better tune on a Wildcat than you did!
Best regards, Chuck
Click to expand...

And btw, thanks for the compliments. I might know my WC fairly well, almost like you know yours. But ER knows ALL the FX guns that way. I'm going to say I think I had good support and maybe got lucky discovering a way to sneak up on a good tune :)


Oh, and Likkity, adjusting the probe isn't a matter of loose or not. Probe depth is a measurement in the hole at the back of the breech to the back of the pellet probe. There are a couple of ways to adjust it but I think it is something like 28.5mm - 28.8mm. Those aren't the exact numbers. I set mine at 28.65 since that is close to the middle of the range. And as long as I do it the same every time, I should get the same efficiency.

Crusher
 
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