POI shift ?

[Trucker3573]

I know this has been hashed a bunch and we all know the brand that gets chastised the most for it. I am looking for everyone’s input. Now I can see if the poi starts moving around during your shooting session and the wind hasn’t changed that’s a problem. But from day to day or whatever time frame you pick is it that uncommon ? I watch a particular PB channel on YouTube that puts out a video every single day. He has and does a lot of gun reviews. I’ve seen numerous times where he takes a PB rifle out that was perfectly zeroed at some point prior as I’ve seen it used in prior shooting or hunting vids. In subsequent videos it’s the exact same setup. They almost always require a slight re zero, never being the exact same from previous use

 

[Chukar60]

I believe it is an issue and not just with FX. I have seen people report other makers guns doing the same, just not near as often as FX.
I own several of the most offensive FX guns and it is not an issue for me. My Maverick and neither of my M3’s have suffered the malady unless dropped or some other form of impact has occured and it has to have been significant. It has only happened a few times and both were due to Impacts on the gun.
I had an interesting thing happen this year shooting an indoor league. I thought I was fighting my Maverick 600mm 22. The gun is very accurate but would be shooting 10 rings regularly when I did my part and then would shift low and left. The low and left shots were consistent and overlap the targets presented very good groups. This went on for several weeks until I noticed the gauge for the bottle was reading higher than the tank gauge while filling. Further study showed the bottle gauge was reading 45-50 bar higher than the fill tank gauge. I can usually get 3 full 18 round magazines
+ 6-7 more shots shooting 25.39 pellets. The league is a 30 target course with unlimited sighters. I run the gun with the second reg @ around 135 bar. With the bottle gauge only filling to 195-200 bar I was falling off the reg when I thought I had plenty of air.
Is this the cause of all suspected POI shifts? I doubt it very seriously. However, it is one of many things that can cause a gun to suffer POI shift.
I believe also that the popularity of high magnification FFP scopes with parallax adjustment are another cause because I do not think to many people know how or go through the trouble of making sure their parallax adjustment is as good as it possibly can be. These scopes are particularly fussy at their higher magnifications and at very close range. I will confess that Both the Impact and the Maverick cheek rests are miserable and need an after market riser for them to work for me. Change your cheek weld and you have POI shift.
I agree it happens but I also believe there are more instances where there is a practical and preventable cause.

 

[Ultralight]

Following. This is a problem for me. I'm trying to figure out if it is operator error or some other factors such as temp shift for PCP. I can shoot in cool 70+ degree, and then go to 90 degrees in the noon sun. I wonder if this is a major cause of POI shift for PCP.

 

[Ta-Ta Toothie]

No poi shift with my 600mm King.

 

[kwaping]

It's possible that FX has the most reports of this simply because they are very popular guns.