Having vertical POI shift during fill range. Help?

The entry level PCP from FX with grown-up performance! Together with the 12 or 16 shot variant, the FX T-12 in all types (FX1000 / FX1000-22 / FX1002 / FX1002-22 / FX1012 / FX1012-22 / FX1212 / FX1212-22). Also known as Logun Solo. The Biathlon model is also based on this platform.

Having vertical POI shift during fill range. Help?

Postby pplauche on Mon Oct 25, 2010 6:56 pm

My new (3 mo.) FX T-12 Whisper (FAC) is experiencing a dropping point of impact through my fill range of 200-100 bar. It almost stops from 130-100 bar but still drops a little.

THE FIRST THING I DID WAS CHECK IT OVER THE CHRONY AND IT WAS SHOOTING FLAT... 820-840 feet per second over 35 shots with 18.1 gn JSB's. (it has the extended air tube & gauge, not the extension.) I ran 2 shot strings to check and they both showed the same.

I went through at least 10-12 shot strings (200-100 bar fills) and they all did the same thing. It is a consistent problem.

From 200-140 bar the POI drops about 1.25" @ 30 yards. from 140-100 it only drops around .25"

At this point, I'm assuming something is expanding and contracting during the shot string.

Things I've tried with no luck or change in problem:
1. checkd tightness on barrel screws (2), air reservoir hub mounted to receiver (1), Barrel band (3), shroud (1), stock-reservoir (1)
2. removed barrel band
3. tried padding between stock and air reservoir with .125" foam, also tried it between receiver and stock
4. added another screw from stock to receiver (no change, but made it "feel" more solid)

Any ideas? Thanks in advance.
pplauche
 
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Joined: Fri Oct 22, 2010 2:49 am

Re: Having vertical POI shift during fill range. Help?

Postby bds on Thu Dec 11, 2014 10:54 pm

Hi,

I'm having the exact same problem. Did this ever get solved?
bds
 
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Joined: Thu Jul 03, 2014 9:53 am

Re: Having vertical POI shift during fill range. Help?

Postby bds on Sun Dec 21, 2014 11:19 pm

Nobody? Is this forum still alive? :-)
bds
 
Posts: 7
Joined: Thu Jul 03, 2014 9:53 am

Re: Having vertical POI shift during fill range. Help?

Postby cyclone sniper on Mon Dec 22, 2014 6:53 pm

hi have you a reg fitted ????
FX cyclone .22 FAC,
cyclone sniper
 
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Location: co Offaly Ireland EIRE

Re: Having vertical POI shift during fill range. Help?

Postby bds on Mon Dec 22, 2014 7:01 pm

No, I don't have a reg. But how does a reg help if the shot string already has very little velocity variation? All shots are within 265 +- 4 m/s.
bds
 
Posts: 7
Joined: Thu Jul 03, 2014 9:53 am

Re: Having vertical POI shift during fill range. Help?

Postby cyclone sniper on Sat May 02, 2015 9:22 pm

did you get this sorted ???????????
FX cyclone .22 FAC,
cyclone sniper
 
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Location: co Offaly Ireland EIRE


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