Poi shift In FX Impact

[mohidris017]

I don't know man. I have the same problem and I guess airguns has this problem so we going to have to deal with it. Check your zero every time you go shooting

Hi Guys
Thanks For Yours Tips
but i wanna add some additions info
i test in isolated environment
i use rest and rifle is level and bubble is in center
tank pressure range from 230 ~ 170 bar
woogie_man (yes and plenum and rest of rifle are completely aligned )
from 230 to 210 in 12o clock
210 to 200 in 3 o clock
200 to 190 in 6 o clock
190 to 170 in 9 o clock
and below them goes to 12

 

[mohidris017]

Hi Guys
I have a problem with FX impact M3
I found that my poi followed a repeatable pattern through the course of a fill
there isn't any contact between the barrel and air tube
barrel cleaned and scope parallax is ok ,scope rail and mount is tight enough and liner is indexed
ES is only 5fps in shoot steering(more than 50 shoots) and 5 shoots group is very tight(8~10 mm in 50m)
but group shift have clockwise pattern start from 12 to 3 then 6 and 9 and last 12 after zero in each of them
any one have a suggestion?

Check the liner. Make sure it is not moving or rotating inside the housing if you have changed your liner, make sure you hand tight the jam nut then give it quarter turn with wrench Don't forget to apply some loctite blue

 

[Hudo]

is the MV changing? I'm thinking unstable pellet yaw as it slows down.

 

[wooferocau]

FX - Impact M3 ... POI change journey.

Hi all, I am a LONG time shooter ( powder burners ) form way back ..my passion is precision and ELR. I am lucky to own a big property and have several ranges set up out to 3500mtrs to which myself an friends often shoot. I have always had a soft spot for airguns , dating way back. Several...

www.airgunnation.com

 

[Timo]

EXACTLY the same thing with my sub 12 177 skout epoch
Shooting position static, cheek firmly welded. I'm not the best of shots but eye and cross hairs don't leave the 10mm zero'd group at 26m then it progresses out an inch reforms a group then again and again.
36 magazine over and over.

No clipping to see
scope tight
Barrel tight
No sign of pellet deforming from mag
Tried manually loading with same results.
Skout's a real epic!
Very pellet fussy.

 

[.20calguy]

Any chance of pellet spiraling?
I saw a video once by Ted Beir showing spiraling. Interestingly the gun would still shoot groups, but the groups would move around the spiral axis with range changes.
My suggestion would be that pressure changes may have the same effect moving the group in the spiral axis?
I want to add that you may have to get a look at your pellets flight path. Ted used a high speed camera. I've seen people paint the pellet skirts white to light them up.

 

[HogKiller]

EXACTLY the same thing with my sub 12 177 skout epoch
Shooting position static, cheek firmly welded. I'm not the best of shots but eye and cross hairs don't leave the 10mm zero'd group at 26m then it progresses out an inch reforms a group then again and again.
36 magazine over and over.

No clipping to see
scope tight
Barrel tight
No sign of pellet deforming from mag
Tried manually loading with same results.
Skout's a real epic!
Very pellet fussy.

If your scope is a FFP then there is a great chance your parallax is off, if a SFP scope then your crown on the barrel can be off or you've got a bad scope. Just a few thoughts.

 

[Timo]

Thanks
Played about lots with optics focus and parrellax focus.
Scope is wulf defender so not likely to be that. I will expect that it might be the meat popsicle behind the gun. But it happens when I'm not moving at all.
Change of spiraling pellets changing poi with small change of pressure, but can't really tell at 26m

 

[Timo]

Thanks everyone
Had a re-think, saw a small amount of spiral at short range (26m) so push on at (70m) and saw more spiraling.
SO tuned power down.
PROBLEM SOLVED thanks all and thanks to a great vid from Matt Dubber at AirArmsHuntingSA

 

[confidis]

Whilst hunting I noticed my maverick shroud/ barrel banging about rattling and 'resonating' whilst bashing about in the woods on checking zero predictably it was off . Looking at the gap between shroud and frame I thought , well that's stupid what do you expect. Simple answer to fix it PTFE
Plumbing washer. Stiffened shroud tensioned barrel and has 100% fixed my problem. Sniper.22
23g @ 1030 . Maverick and impact look to have the same design fault.
Cheap quick simple works probably not expensive or complicated enough for some to cope with. Try it . Hope it helps .