HELP—UPDATE: FX Wildcat accuracy problems

That's actually very slow fps for all fx rifles as far as i know they like 900 to 930 fps . Might need reg adjusted?

I know it suck to hear, but most people i know with an FX gun or any gun for that matter, has sent there gun in for a tune from Ernest or someone else or done it themselves, I don't know the particulars of tuning (o-ring, regulator, polishing barrel, etc) to fine tune them to get the most out of them. I've own Impact, Tactic, Cricket, and S510 and all have seen Ernest except the S510, and they all shot better once i got them back. Most will tell you to check for clipping, but it sounds like you have already done that by removing the huggett. Most will tell you that FX really only likes JSB's, but don't know if that is true for the X barrel, but i'm sure it done at least love them. I know my gun like pellets shooting between 825-900 FPS so for a start bump your regulator up to achieve that speed. Then do some speed testing to find the best consistent groups .

I was going to say loose barrel but sounds like you got that covered. Im not familiar with this gun so not sure if its sigle shot or mag fed. If mag fed have you tried signle shooting it to rule out mag issues? Only other thing I could think of is loose lens in the scope?

Is it a magazine issue, are whole mags good, then a differnt Magazine is bad?

Is there an "adapter" screwed into the end of the barrel for the Huggett? If you just removed the moderator and not the adapter, you might have some clipping that your not aware is happening. Might give it a try, have seen this as an issue before. Keep us posted and good luck.

I've been toying with a .177 MKI trying to get it to 12ish FPE. I can't compare barrels but can tell you that I'm getting the exact same results (pretty decent chrony strings (after many hours of additional work to limit the plenum size) but completely unacceptable groups at 30y (and more and less). On a good group, 1/2 to 3/4 inch, but most are 2-3 inches...

After struggling with this for a week or so, I took the gun back up to 19-20 FPE and it shot fine. The FAC version just wont do speeds that low. 765 fps with a JSB 10.34 is 13.5 FPE. After all the work I've done, I've circled back to the valve spring vs transfer port vs hammer spring tension (the first 2 I'm not modifying) OR these barrels just wont shoot at lower speeds...

If that's where you want it, I have no magic to help. But I'd take it up to 18-19 fpe (880 - 910 fps) with the 10.34's and see what it does.

My attempts have been through the stock FX reg, HUMA reg and hammer spring tension adjustments. My HST nut was not lock tighted and actually moved with ever shot I took so I had no issues adjusting it. I did use 'vibratight' on it to hold it in place once I started playing.



I use the hammer spring to fine tune consistency more so than over all power but adjusting it may be all you need to up the power. Just cant tell from here. I will say that my HST adjustment led to some pretty wild changes so if you want to spend the time... I'd try both tightening it and loosening it to see what happens to your speeds (1/4 to half turn at a time).

There are a couple other threads with LOTS of info if you dig through them. I'm new to these and can really only speak to my one experimnt.

I would leave the reg alone. The fx regulators are not easy to adjust, without proper tool. If you have a new gun you will void the waranty, and might just screw the gun up. It also is probably not nescesarry. But maybe you should try the 8 grains JSB first? The gun might be tuned for thouse pellets already. If you absolutely want to shoot the heavy pellets, adjusting the hammer spring should be easy to do, as long it is not locktied to hard. I would mark the factory setting with a pen first, or write down the crony numbers, so you can always bring it back if you need.

I also own a wildcat mk2 in .177, which I only got to shoot good with jsb excact 8 grains until I tried a tin with 4.53mm head size. My tins of 4.52 probably was undersized, or had to small head diameter for the barrel. So for my gun switching out my "old" tins of 4.52mm with 4.53 did the trick for me. A way to check if the barrel grip properly, is to push pellets trough the liner with a rod, and compare how much the barrel "scratch" of the head of the pellet.

I will attach a picture I took after pushing different pellets trough the liner. From left to right: JSB-4.50,4.51,4.52,4.53, and the two most right: stoeger x-field (H&N field target throphy made by H&N for stoeger), and RWS superdome. Of the 4 jsb exact 8 grains the first samples from 4.50 to 4.52 hardly has any marks on them, and only the biggest 4.53 sample shoot good in my gun. The x liner or probably any gun doeas not like to small diameter pellets. 

BTW I do not know the real head size of the pellets I own, as I do not own a tool yet to measure them presizely. But as I understand it head sizes can differ from when and what tool was made when manufactured. So your tin of say 4.52, does not nescesary have to be to small. But I would guess a tin of 4.53 would make it less unlikely.

tor47 - Looks like you are in Norway. Did you start with an FAC gun or one that was built for the 12fpe market?

It is a FAC gun. Was a litle surprised it was shipped with the x-liner, as the online store I bought it from said it was shipped with a smooth twist liner.

I had some issues with mine when I got it. The regulator was not stable, espesially when the main reservoir pressure got below 150 bar. After I did chrony the gun, and also attached a manometer at the bleed hole in the block, I found out it was jumping randomly 10 bar up or down. Did not wanna wait for a long repair, and bought and installed a huma reg instead. So I may have woid waranty on my gun. Got it shooting pretty good on 25m (has not tested it further), but still have some random flyers which I do not know the reason for yet.

My .177 sang at 18-20 fpe and struggled anywhere below 16fpe. Try the 10.3's 890-920 and see how it goes (like JCD said )

Looking forward to results - I'm interested to seeing how the X liner works once at speed.

You said: "While the reg shows consistent FPS, shots that go wrong I can see the pellet flying in a different direction". (I know you meant PSI) And: "All pellets shoot just like in the pics below. 2 great groups, 4 -5 Terrible groups".

With the light at the right angle, most of us have see the pellet flight. If the velocity is consistent, and it's not your technique, Occman's Razor would indicate a mechanical problem. But WHY intermittent? If it was mechanical it would likely occur with regularity, but operator error (trigger control, differences in hold, breath control, and the list goes on), can occur randomly. 

If you have other AG's and have good results, accuracy wise, then this is a mystery.

My AG experience is mostly with HW Springers. I do plan on diving in head first this fall with a FX .22 Impact along with an AV compressor and all the other "stuff". I'll be watching to see your solution.

After rereading you said something about: "All shot string from Mag 1 to Mag 12", I'm sure you looked into this, but do you have 12 different magazines? I know you did this, but... try using just one magazine (a proven good grouper) for your groups. Good luck! 

What about time of day? Temperature, wind, sun or shade on you or the gun? Do you notice if this has any correlation on what you are observing of the results each time you shoot? Does it shoot well for the first few shots and then when the barrel warms up it starts spraying? Maybe a particular pressure range or so many shots after a fill? Same results at the top of a fill as opposed to the bottom of the fill? Any correlation you can predict will help narrow down the culprit.

Using the same setup each time, same fill pressure, same bench, same bag placement, etc. Any of this ringing any bells?

What about weighing or head sizing the pellets? (based on your result you mentioned of seeing the pellets with good speed tracking off target line)

You probably already know this but keeping good notes on what you try and things like time of day, temperature and wind velocities along with the variations you are trying will come in handy when experimenting.

Good luck, keep us informed.