NOT Holding zero

Could simply need the barrel needs cleaning

I have the same issue with my Crown. The zero moves from day to day. I think it is the barrel register in the receiver, it is too loose and moves around a bit with just the lightest jarring. I don't think it's fixable.

Have you tried shooting fully benchrest (front supported by bipod or benchrest and rear supported by bunny ear style rear bag)? And do you see the same behavior from day to day Or do you store it resting against the barrel?

I was having a similar problem and it was do to temperature change from day to day or morning to evening.

Jim

Clean. Barrel. Get the chrony out.

I am shooting from a bench rest using a bipod so the cross hairs are very steady. Only notice my heartbeat moving them slightly. I don't store the gun leaning or touching the barrel. It primarily goes back into its case when not in use. I have been testing this issue for over a week now to make sure it was the crappy shooter to blame but after testing it over several different days there is something wrong for sure...

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If you support the rear by hand and shoulder there is a chance that this is just a hold issue. Hold needs to be absolutely consistent or you'll possibly experience something similar. If I change my hold during training the POI will change between holds.

Is the shroud properly tightened? Is the end screw of the STX barrel liner system tightened (not under or over tightened)? Sounds like something is settling differently each time you take it out. Might also be due to temperature like said above.

Just to cover all the bases... Change the scope out. I have a scope in my collection that is haunted, too. When I mounted it on my P-rod it will change POA by 3-4 inches day to day, at my 40 yard back yard range. The turrets are worn or broken, I think. I have 4 other scopes from the same manufacturer and this one is the only one to have that issue. It was on my son's Ruger 10/22 and I gave him heck for not being able to stay consistent with his gun. Turns out it is the scope in our case.

Is your scope parallax adjusted correctly? Any changes in wind from day to day?

Same rifle and scope combo here. I fought and am fighting a similar issue. I'd have it zeroed before I went pesting and when in the field sometimes at 50 yds it would hit 4"high. Ditto on the scope. I had a Hawke on the rifle that did the same thing. Sent it to Hawke and they sent me a new one and said I had a manufacturing defect in the old one. MOST of the issues with changing POI are now being discovered. Ditto on the chrony. I have shot 5 full magazines at different times through the chrony. At 50 yds a quarter would cover any one of the groups. I thought it was the regulator as my FPS spread during those magazines was rediculous. But...the group even with a large spread in FPS didn't chage the POI.. 

I did notice the first shot after having not shot it for awhile, and I haven't figured out what the 'awhile' is yet, Hits about 1.5" below the POA. That's consisten with every magazine and I sometime waited overnight before i shot again. I have done a lot of shooting and fought flinching with handguns until I relearned trigger squeeze. One would think that would not be an issue with a PCP rifle. It is and was for me. IF I really concentrate on the squeeze I get much better results. I have a really light trigger on my WC 2 set for me as a request from AOA. After a few thousand rounds I can now feel 'slack' in the second stage before it fires that I wasn't even aware existed until I really started paying attention to it.

So...Do a chrony. Try a different scope on the rifle or send that one back. Be sure to get a RTA # first. (Hawke is great. Tell them an issue and they'll send you a shipping label. I even got a call from the tech who examined my scope). And even those who have shot thousands of rounds through various guns sometimes have to revisit the basics like breathing and trigger squeeze. This hobby is both a type of love as well as a curse (at times).

I had the same issue with a Crown, although not to the extent you describe. I don't mean to be a naysayer to an entire technology, but I'm just not a huge fan of this barrel assembly. In addition to the barrel inlet at the receiver, you have the sleeve, liner, muzzle nut, air stripper, shroud, suppressor. All of which has to be held together in a manner that will not be influenced by all the various external variables. Maybe this is a design for the millennials who value lots of bells and whistles, and who undoubtedly would say I'm a grumpy old man and behind the times. Maybe we're both right. I wish you luck in sorting out your issue, and I know it can work much better than your current results, but it ain't perfect. 

A good friend of mine just bought a Wildcat MK2 from Utah as well. The barrel was junk. The gun would not group, even at 25 yards.

He sent it to FX USA and they verified that the barrel had serious problems that could not be fixed. Thus they sent him a new barrel as a replacement.

Sounds like this was not an isolated issue. The last thing I want out of a brand new rifle is to learn it has a serious defect.

FX brags about their barrels, and now I've seen first hand that the barrels tend to have serious issues.

I 2nd or 3rd,lol, the changing of the scope. I'd do that before I started finaggeling? with the shroud and barrel tension.I've had scope woes that sound oddly familiar to your experience.

A good friend of mine just bought a Wildcat MK2 from Utah as well. The barrel was junk. The gun would not group, even at 25 yards.

He sent it to FX USA and they verified that the barrel had serious problems that could not be fixed. Thus they sent him a new barrel as a replacement.

Sounds like this was not an isolated issue. The last thing I want out of a brand new rifle is to learn it has a serious defect.

FX brags about their barrels, and now I've seen first hand that the barrels tend to have serious issues.

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I wouldn't say it is a tendency with FX, but bad barrels/liners can occur with any make. I had to replace the barrels on a new Daystate Red Wolf and Brocock Bantam. My FX Royale 400 with the original Smooth Twist barrel has been perfect. It would be good to know the maker tests the rifle sufficiently to catch such a gross error, but it happens with high volume production.