FX Wildcat 25 MKII performance before Huma

First three shots in each string seem to be the slowest shots in each string . Did you refill to 230bar before each string ? Or the reg could be creeping up between strings maybe .

Without the first 2-4 shots, those figures aren't to bad. If you hadn't said that you dry fired it a few times, I would have thought, a classic case of reg. creep. You'll just have to wait and see when the new one arrives.

have you checked the hammer spring, maybe the tension on the spring is too hot
try to reduce to the beginning the tension and load a bit every time when the speed stop to up.
my friend have the same problem he solve with some work on the hst

My guess is the STOCK reg is creeping (just like my research has found for me). Look at the 9th shot each time, 8 shot mag right? That delay in reloading (or changing the mag) causes the 9th shot to be lower in velocity then the next shots. To me, this indicates the pressure in the plenum being higher.
I could be wrong and this could be entirely ransom, but my WC did the same exact thing.

I don't have the MKll Wildcat, just the original WC but I chronographed it when I first got it from Utah Airguns and it was shooting right at 895 to 900 fps with a spread of 12. It was a very accurate rifle ... literally a hole on hole rifle.
​I have the gun in the shop at FXUSA right now getting them to check out the regulator, but I made a shot string just before sending it to Wilmington and this was the results shooting the 25.39 grain JSBs

1 ...783
​2 ...822
3 ...844
4 ...841
5 ...856
6 ...842
7 ...847
8 ...852
9 ...839
10 ...846
11 ...839
12 ...832
13 ...839
14 ...835
15 ...862
16 ...868
17 ...861
18 ...866
19 ...856
20 ...843
21 ...850
22 ...850
23 ...853
24 ...857
25 ...857
26 ...849
27 ...860
28 ...873
29 ...858
30 ...858
31 ...849
32 ...870
33 ...872
34 ...869
35 ...855
36 ...856
​37 ...864
38 ...858
39 ...862
40 ...864
I threw out the first two shots because they were so far off when considering the extreme spread but the stats for the string with those two shots removed was
​Hi 873 / Lo 832 / Avg 854 / ES 41 / SD 10

​Out of all 38 shots that I counted there were 5 in the 830s, 8 in the 840s, 13 in the 850s, 9 in the 860s, 3 in the 870s.

​Still, for a gun that origionally had a es of 12 with the majority of the velocities between 900 and 895 and a real tack driver ... to a gun where I have no real idea where it is going to hit within a 2.5 inch circle at 60 yards is not acceptable to me either for target practice or small game hunting.

"likkitysplyt"
1 ...783
​2 ...822
3 ...844
4 ...841
5 ...856

Click to expand...

This is a classic example of what happens when a regulator experiences creep.

BTB ... Yes it is and it doesn't even resemble the kind of results I got from chronographing the gun when it was new. 

​As it is I have no idea whether the next shot is gonna be coming out at 870 fps or 830 fps and when you add a little bit of distance to that equation, it throws your POI all over the place ... I seldom take shots less than 60 yards. Gonna have Ernest do a tune to it while it is at FXUSA as well as replacing the regulator ... the gun is still under warranty.

looking at the shot string for the standard JSB 25's that would suck if it was in a standard unregged Marauder. Getting that shot count, and that spread from a gun costing triple that then having to buy an after market regulator? I'll stick with a Cricket.