Poi shift In FX Impact

The first thing I would try is single loading to eliminate the magazine from being the issue. I assume you cleaned the barrel.

That is the coolest POI shift I ever heard of. Here is what I would do. I would loosen the set screw that holds the barrel in then slide the barrel out. Then I would slide the barrel back in and right when the brass transfer port gets to the breech block, make sure it’s lined up perfectly and slides right in. If your whole gun was assembled and aired up incorrectly and your barrel is on a slight bind, that might explain some things.

Gotta say, that's weird. Is this your observation from a single fill, or has it repeated through several cycles? I assume all groups were with the same pellet, and the rifle in the same position. If a one time occurrence, I would say it's changing conditions, that coincidentally showed that pattern. If it consistently does it, well, that's just very strange, and you have a magic rifle.

id say binding something

Have you taken apart the rifle? You can have the rear of the gun twisted and it will cause issues.

If you degas the gun completely and make sure everything is tightened and square. Then air back up and see if you have the same issues.

Do you have a bubble level on your scope? Could be scope cant. Maybe try shooting tethered for the same amount of shots you would fill the tank on your gun. Are temperatures changing throughout your groups? Also try shooting consistently with the same cheekweld, grip, and shoulder to stock pressure. Just some thoughts.

Wind? From front and from rear........
Bubble?
Mirage? How the sun is following? From front to right and around?

Hi,
Did you get the solution . Pls update. Seems like I am also starting to see a shifting POI pattern in my M3 wrt pressure.

kavna said:

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

Click to expand...

,

Why don’t you give us some history of the gun- what internal mods have you installed, Ammo type, caliber, etc.

Me personally I noticed early on when shooting pellets, the groups are best with a full mag, and somewhere when the mag gets to be only a third full, groups slowly start to open up. I’ve found that depending on the tension of the internal spring inside the mag, it can cause pellets to tilt as the spring pressure forces the pellet against one side of the mags exit hole, and it gets worse as the mag empties as there’s less weight from the pellets.

Because of this, I try to stop shooting and refill the mag when it gets down to the last 10 or so pellets.

And if you’re using a pin style pellet probe and if this is going on with your mag, that pin probe exacerbates things.

Without you realizing this, the start of a full mag is in line with a gun freshly pressurized full, then as you cocky thru your mag, coincidentally your air pressure is dropping and you are more focused on the air pressure being the cause of impact shifts, when it could be a problem with your mag.

So like was suggested, rule the mag out by single loading, and if your shooting pellets stay with a pellet probe, not a pin style

I had the same problem today i was trying to do some pesting missed my first 2 shot i knew something wrong went and checked my zero and its 2 inches to the left i zeroed yesterday and test it at 50 and 100 yard i have tensioned barrel system I did not drop or hit the gun i careful handle it and keeping it on the foam box still poi shift?!?!?!

Do you ever grab the gun by the barrel taking it out of the safe or it’s case?

Whenever I removed my liner for cleaning, I wrap a layer of teflon tape and install the liner nut.
Very recently I got the barrel tensioner. And I lapped the liner "seat" into the nut. Also made a new 10 mm socket for my torque wrench, I want to know that I am torquing the liner nut consistently, in my case I set it to 1.7 Nm, which is the lowest value on my wheeler digital.

Struckat said:

Do you ever grab the gun by the barrel taking it out of the safe or it’s case?

Click to expand...

No never also my scope is tighten really good i treat my gun like I'm treating glass I carefully hold it take it put it down like a baby

Struckat said:

Do you ever grab the gun by the barrel taking it out of the safe or it’s case?

Click to expand...

I also marked my tune settings i check it before i start shooting I really can't find any reason for this to happen

I really do not know what is going on.

Every scope may have a change on time on POI..... The scope need to be on Zero after reticle "rest" after making some movements to the clicks....... Well that is something true, but the clockwise pattern without moving anything to the scope looks witched !!

If you’re talking about the first few shots after the gun has been resting, it’s a common problem. The first few shots are often at a lower speed due to sticking O-rings. Here’s a very long thread discussing it:

Suppose that the barrel is loose and can spin clockwise with shots.... If that happens, maybe, (and would need to be confirmed), that pattern might be possible..... Maybe ....

Hi Guy's, my first post here. I have a brand new MK3 with 700mm superior slug liner in 22. Scope Vector Venom and experiencing the exact same issues as described by Kavana. Any other suggestions please.