FX WC Wandering POI, penny for your thoughts.

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I only tightened the clamps to the tube with at least 100+ bar in the tube. Did it once when empty and you couldn't budge the screws. It does expand.
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Well then here is probably your answer. Tube expansion and contraction plus flimsy orings in the same bracket to center the barrel equals an inconsistent gun. Someone should offer a scope tape for Wildcat owners. My guess is one of two things concerning some guys not having this issue and some do. One, FX had two different batches of tubes and there is a tube lottery. Or two, there is a magic torque setting when tightening the screws on the clamps.
 
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These type of problems on guns, high end or not intrigue me. I also know a while back I told you everyone needs a .177 in their arsenal so it looks like you made a good choice only to be kicked in the coin purse with this issue. I took a look at the parts diagram for a Wildcat. I believe the key is in the three components that hold the air tube, barrel and scope rail. I would contact FX USA and see if there is a torque setting and a sequence for tightening all these components. Do you torque the tube clamps with the tube empty or full. Get the gun back together set properly and go from there. This is not the first gun with a wondering POI that seems to be related to pressure in the tube. Why doesn’t a Taipan do this? It’s built like a tank with a stout tube and no orings supporting the barrel. Taipan does not care about weight savings but there is a tightening sequence when you put a Taipan back together.
 
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I’m beginning to suspect that there maybe something to that theory. Can’t test till Sunday. I may do it your way and see. (Fill to 100 first) Before I do that, I will shoot tethered for a minute and see. But I will tell ya, I am aware of many a .25 Wildcats that get re-done, tube tightened up first, always, and never have this issue. Also, there are the FX Masterclass videos up, that sequence should be in there if pertinent. 
 
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Personally I believe all torque settings should be done with an empty tube. It’s part of the assembly process. Did FX overlook something and guys have found or stumbled upon a better method of locking all those components down for better consistency? Hard to say. Did you buy the gun used? If so there is always the Johnny Hamfist equation to consider. If those clamps were loosened with a pressurized tube then tightened, you would never get the proper tightness compared to when the tube is empty. It would have no choice but to float as the pressure changes. Empty that tube, loosen everything including your scope rail to eliminate binding, then tighten everything up. If you don’t want to call FX to see if there are actual torque settings, just make everything PCP gun tight. Not farm tractor tight. 
 
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I hope you figure it out. I really like Wildcats, just never bought one. Three bullpups are enough. Have to head to my tree stand soon but I will check in to see if you get it ironed out. Those screws should be a bear to remove with the tube pressurized. If they were tough to remove with no pressure in the tube, then that tells you FX wants them tight. 
 
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OK, I'm a moron! Well, not really, but at least I'm a bit blind. Turns out, the liner screw has 2 O-Rings and they are both in place. I guess I did not have enough light to look into that tiny space and what I perceive to be an empty groove, was actually a seated O-Ring. Which explains why I could not sit the new one. 

However, that is bad news because it is one more thing that is actually not wrong with the gun and it doesn't solve my problems. I'm topping off my. Omega now and getting it to at least 200 bar. Shot the gun this AM and it was perfect POI same as 2 days ago until it hit just below 150. Then it scattered the shots all over the place. So I tethered to the tank at about 175b and was still getting inconsistent shot placement. 

I personally do not thing there is anything wrong with the hammer and valve system because the speed variations are (well, were, before my Chrono took a dump) pretty tight when the spring adjuster screw was titelocked. Will report back again in the PM after I empty the tube, loosen it up, fill to 100 and re-tighten. If that doesn't work I'm getting to the point that someone is gonna be getting themselves a project gun in the not too distant future. (with full disclosure)
 
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I am building arrows and have a few other things to do but I will keep checking in. For most of us that don’t have a couple PCP buddies that can come over to our house, having a issue that requires brainstorming or spitballing sucks. You have to jump back online and drum your fingers waiting for a reply. I may not have all the answers but I like a good mystery, especially when it’s not mine, so I will try not to give up until you do. I wouldn’t rule out resetting the gun up tube empty and tube at 100b before giving up. If something is on a bind, when that tube pressure changes, it could mess with your POI. It could have happened at the factory. Hence the guy selling the gun because he got frustrated and just chalked it up to FX’s and 177’s don’t jive.
 
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OK. Done. Filled tube to 100b, tightened screws. Gun tested while tethered at 190b with ok to real good results so far. Shot a few groups that stayed pretty consistent so far. I would say about 1/2" or so at 28 yards. Plenty hunting accurate for me. Untethered and shot it down to 110b or so with actually excellent results so far. Same as before, about 1/2" or so at 28 yards. Speeds remain consistent with JSB Monsters at an average of 780fps. Letting gun sit for a little while and will re-test in a bit to see if there is any shifting of the POI. I did fill the gun to 190b or so and just resting it now. 

On a side note, and talking about arrows. Can this thing be made into an airbow? I'd be inclined to mod it into something like that and keep it if so. 
 
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I feel your pain as Ive been in your shoes before with a gun. Literally tried everything to make it shoot 15 different types of pellets different head sizes many things. One day it'd look like it was working then the next time just a joke. Something ended up failing on it and ended up splitting it up and selling stuff for parts.

I hope you figure it out
 
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I had the exact same problem with my WC2. Fussed and tried all the things folks said on here. Results same as you. I bit the bullet and sent into FX USA eating the shipping costs. When I got it back I left in the shipping box unopened, and sold it. Of course the buyer knew all the details before the purchase. I have heard nothing from him so I am hoping FX really did something to fix it. Others can chime in but I think FX has a pretty liberal repair policy and yours might still be under warranty. It's worth investigating.
 
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