FX Wildcat consistency problems

[bchannell]

Yes, I tried both ways up and down. I've picked spots along the way and went from bottom to top of hammer strike. The hammer is factory 11.4g. I tried a softer spring with no improvement.

The overall rise and fall in velocity is evident from ~550fps to well over 1000fps, no problem. Consistency is the issue.

I have worked from the bottom up and from the top down, no joy.

 

[MongooseV8]

Yes, I tried both ways up and down. I've picked spots along the way and went from bottom to top of hammer strike. The hammer is factory 11.4g. I tried a softer spring with no improvement.

The overall rise and fall in velocity is evident from ~550fps to well over 1000fps, no problem. Consistency is the issue.

I have worked from the bottom up and from the top down, no joy.

Ok so at which settings do you see an fps plateau ?

 

[Scotty1]

I’m curious if you’re watching your second reg pressure between shots, to see that it’s refilling to the same point each time. Maybe wait 30 seconds between shots, and see if it evens out some.

 

[bchannell]

OK, I admit my head is hard. I thought I was starting somewhere in the middle and working both ways, but until someone challenged me, it occurred to me that I wasn't working in the upper direction far enough. I thank you for setting me straight and making me think.

As to the question of reg plenum refill, yes, I have tried all different "timings" and nothing definite has appeared. Some "quick" shots are high and some low, and the same for longer waits. So, I've adopted the 15 sec rule for the most part, even though I take one shorter here and there simply because that would be how I shoot and I want to know that scenerio also.

So, Here's my new plan based on you guys getting my head in the game.
1st reg 150 bar, 2nd reg 100 bar, FX 18.1 gr pellet. Just somewhere to start anew.
My plan is as follows
(screw turns out-power wheel setting)
0-7 shoot 10 shots
1-7 shoot 10 shots
2-7 shoot 10 shots
etc until I find the point of no increase in velocity, they go down the pw 7,6,5 etc and backward til the plateau is found.

I'm only partiall done, but can make some definite conclusions.
0-7 861 fps avg, 27 fps es, 8.0 stdev 9 shots
1-7 922 fps avg, 27 fps es, 7.5 stdev 10 shots
2-7 961 fps avg, 29 fps es, 9.2 stdev 10 shots
3-7 980 fps avg 11 fps es 4.5 stdev 17( I threw out one shot that was extremely low, and assume it was a bad pellet)
4-7 990 fps avg, 12 fps es, 3.1 stdev 15 shots
5-7 992 fps avg, 10 fps es, 2.7 stdev 14 shots

Conclusions: (updated)
The plateau is around 992 fps. This pellet in this gun is probably not a great choice, but lowing the reg might do the trick. It likes to shoot above 38 fpe, at least with this pellet.

Next up is lowering the reg pressure and repeating the full test.

 

[AirNGasman]

Sounds to me like if it's not a hammer-strike issue it could be a bent valve-stem issue.

.

 

[bchannell]

Could be, i dunno, some of it looks fine. My question is if I back it down 3-5%, that puts me in the 960 fps range, where the es is much worse???

 

[greenbeans]

Could be, i dunno, some of it looks fine. My question is if I back it down 3-5%, that puts me in the 960 fps range, where the es is much worse???

Maybe your plateau is a bit above 992 since you stopped once the increase in fps became way smaller. But based on the string you’re certainly close. How much below the plateau a specific gun really l”likes” is individual, 95-98% of plateau is just ballpark. I have guns that do amazing at 97.5-%-98% but open up at 96% and vice versa… maybe your WC wants to be at 97-98%, which would mean 975 or so with the 18 gr. You’d need to use the hammer screw and not the wheel to dial it in for that and try…

 

[bchannell]

Yes, if I do need to use the screw and dial it in. That is next on the list. I had to mow all day, so the cuts into my shooting time, dang yard! But having an 8 acre range is pretty cool.

 

[1handwill.gc]

Yes, if I do need to use the screw and dial it in. That is next on the list. I had to mow all day, so the cuts into my shooting time, dang yard! But having an 8 acre range is pretty cool.

I think you almost have it if I was you I was lower my second right is the way you have the hammer set up right now by about 15 bar and now it start rolling back your hammer spring in eighth of the third at a time until you find the speed that you’re aiming for if you end up a little too low, create your regulator 2 pounds at a time up and then use your hammer spray adjuster until you find the speed you like but I definitely think that you have made some significant improvements on how you can shoot now I haven’t heard anybody say, but with really matters as accuracy repeatable accuracy think about that one this number is don’t mean a thing if you don’t have repeatable accuracy, thank you for your patience You have proved to be a lot more patient than I am myself specially considering that it sounds like you have a lot of nice dance. I’ll be looking forward your progress sincerely, your friend Will

 

[EPG]

Yes, if I do need to use the screw and dial it in. That is next on the list. I had to mow all day, so the cuts into my shooting time, dang yard! But having an 8 acre range is pretty cool.

Hi Bob,

I’ve been following your duel regged WC saga.

Since the purpose of reg #1 is simply to take the load off reg #2, I’d like to see you try setting reg #1 at say 200bar…

Then it would be set up more like a typical single regged rifle.

With the larger (100bar) spread between the two reg set points, your reg #2 should refresh the plenum quicker.

I’ve got a Dreamline PowerPup (not a WC, but has huge plenum and power potential similar to your WC). I’ve had success shooting 18.13g with it at 900-910fps - some great target scores. Reg gauge says 120bar. I can get tighter spreads using 20.83g (or heavier) - but my point is that something seems a bit off that you are getting such choppy spreads even tuned above the knee.

-Ed