FX WC Wandering POI, penny for your thoughts.

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intenseaty22

intenseaty22

Member
Mar 7, 2017
6,669
797
GA, United States
The most prominent issue with my .177 Wildcat is the wandering POI. Last night, before turning in, I sighted in and put gun away. Was shooting near perfect at 28 yards with at least the H/N Barracuda. The JSB Monsters, which will shoot pellet on pellet sometimes, were all over the place. Wake up today, test gun, and POI has shifted, although it's still pellet on pellet. I tried the Monsters again, pellet on pellet. Here are the pictures of today's session so far. Any ideas as to what is going on here? The regulator is a new Huma and is working very consistently. Speeds are very tight, so it's not the gun's mechanics. I affixed a carbon fiber liner to the STX barrel as well. The scope has been tested and there is nothing wrong with it, the gun will do this with other scopes mounted. 

As a sidenote: Please understand that my goal here is not to bash FX, my ultimate goal is to have a gun that is reliable and working as it is intended to work. That's also not to say that I am shying away from bashing a product that is not working as advertised. 

Thank you for your insight. 

1st shots x 3 or 4 H/N Barracuda aiming at the corner of the L, these were hitting the POA yesterday night. See how it has migrated now.

AEDDC0B0-60DC-4C89-A1B5-82C68EFC157C.1602775118.jpeg
 



2nd shots with JSB Monsters aiming at the E, 3 shots with almost perfect grouping hitting low. These did not group last night. 
E53359F3-C81A-4018-91FF-BE4905610BA6.1602775147.jpeg




3rd shot with JSB Monster, single shot after re-sighting gun, same POI as POA. 
98A4786B-7D4C-4B5D-B962-ADD562BD4574.1602775172.jpeg

 
I would do the same test you just did without the can on the end of the barrel. Hopefully you have cool neighbors. Next test I would do is zero it at lets say 200b. After you are happy refill it to 200b and try it the next day. If all that is fruitless, I would polish the barrel. If you have a rough spot that gathers lead, it can cause your kind of problems.
 
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The barrel clamp I highly reccomend to wildcat owners unfortunately won’t work on the compacts, as it will close off your fill probe opening. 

@ Intenseaty- is your moderator touching your air tube in that pic?

one thing I’d like for you to check, if you remove the complete barrel assembly, where it passes thru the air tube clamp holes, there are o rings inside those clamps to isolate the barrel from the clamps. See if those are still inside the clamps.
 
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@vetmx I am able to sparingly shoot without the can without causing much of a stir, but not to do the kind of testing we are talking about. That little thing is LOUD!!! Unfortunately I can't get away from home to do it at a range or in the woods. Can definitely do the 200b test though. Far as I can tell it is holding air just fine. Barrel has been polished already. It seemed in perfect condition before too. 

@blejda Thanks, I can see how that would be a problem. This has been checked on already. Rail is on there really good. 

@bigragu No, the LDC is not touching at all. Has really good clearance. Have not checked on those o-rings, but from the feel of it when I have taken it out before, I believe they are there. Will certainly check on that though. 

Thanks to all. 
 
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BTW I have been shooting it today sparingly throughout the day. Taking a shot as I am working around the house. So far, it’s spot on. Even took a chipmunk at 27 yards, perfect shot placement. Yesterday I shot one when I thought the gun was ok, serious gut shot, fortunately it was as small and must have severed an artery or such a severe shock that it was DRT. 
 
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What if you got the band and cut a hole for fill probe, or cut the band shorter? Possible option for that? 

But I agree with what others are saying. Test/try as much to eleminate whatever possible causes there might be. 

I'd say store it in an upright position with no pressure/force on the barrel or scope. And be ginger with it when you handle it. See if your POI doesn't stay put. 
 
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Orings supporting a barrel is a bad thing for consistency. When I received my Impact back in 2017 it had the same thing and it was my first WTF moment about a $2k gun. Maybe put some Duro 90’s in there. When my new Impact gets here, if it ever does, it’s getting the grub screw treatment. Orings supporting a barrel will get you laughed out of the powder burner world. You would have to sight your gun in every time the temperature changed.
 
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If the POI change while sitting at the bench, it might be the barrel needs a proper clea ing. To rule it out, make sure the barrel is clean, escpesially at the choke area, and try again. After maybe 50 shots the barrel should be leaded in, and should be stable for many shots. If you shoot different brands of pellets, some may leave deposits, which the next brand of pellets is not able to remove. So do test with only one brand which you know should shoot fine. 


 
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You are not alone. Have you “ harmonically tuned” your rifle? That really helped me get the best accuracy. I’ve found any slight contact to the barrel will potentially shift the POI. The barrel to the action and liner to barrel are all less then secure. I have also been surprised at just how much the slightest change in valve adjustment will change the POI. Do you have a delrin bumper in place. I’ve also wondered if hammer springs can fatigue or go south.

I’ve had this with most all of my air guns to a greater or lesser extent You have to continually check the sight in and POI. A lot has to do with conditions ( I do almost all of my shooting at 65 to 100 yards) . Just the smallest change. But I believe that there are some mechanical gremlin(s) at work as well. 
 
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Wire brush and polish the barrel one more time. stick with one pellet that works well. Lightly lube the pellets with Pledge. Check the orings that support the liner tube and lube. The thimble at the breach end of the liner sleeve should have an o ring in there. If anyone ever dry fired it. It would blow it out to parts unknown. Make sure its there. Should be one in the threaded muzzle end also. Pellet probe depth spot on? Chamber a pellet before pulling the barrel system and make sure the pellet is past the transfer port and a blast of air isn't catching the skirt. Make sure the cocking linkage set screws are tight. Any moment there would seat pellets at different depths from shot to shot. 

Hope you get it figured out. Because im getting irritated for ya.
 
Upvote 0
You are not alone. Have you “ harmonically tuned” your rifle? That really helped me get the best accuracy. I’ve found any slight contact to the barrel will potentially shift the POI. The barrel to the action and liner to barrel are all less then secure. I have also been surprised at just how much the slightest change in valve adjustment will change the POI. Do you have a delrin bumper in place. I’ve also wondered if hammer springs can fatigue or go south.

I’ve had this with most all of my air guns to a greater or lesser extent You have to continually check the sight in and POI. A lot has to do with conditions ( I do almost all of my shooting at 65 to 100 yards) . Just the smallest change. But I believe that there are some mechanical gremlin(s) at work as well.
Click to expand...

I don’t think the Wildcat has a delrin bumper or adjustable valve to worry about.
 
Upvote 0
You are not alone. Have you “ harmonically tuned” your rifle? That really helped me get the best accuracy. I’ve found any slight contact to the barrel will potentially shift the POI. The barrel to the action and liner to barrel are all less then secure. I have also been surprised at just how much the slightest change in valve adjustment will change the POI. Do you have a delrin bumper in place. I’ve also wondered if hammer springs can fatigue or go south.

I’ve had this with most all of my air guns to a greater or lesser extent You have to continually check the sight in and POI. A lot has to do with conditions ( I do almost all of my shooting at 65 to 100 yards) . Just the smallest change. But I believe that there are some mechanical gremlin(s) at work as well.
Click to expand...

I don’t think the Wildcat has a delrin bumper or adjustable valve to worry about.
Click to expand...

You are correct. My error. He did say wildcat but it slipped my mind while reading the rest of the thread. The ole brain isn’t as tight as it used to be. Some times I substitute facts without intent . I assume no harm done? I have some younger friends and I’m impressed with what they know that I don’t. The forum helps a lot too if you can sort thru the post from guys like me. LOL Sorry about that 
 
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