All my irons sights are adjusted to move POA left . . . Why?

[twofewscrews]

Hi,

So I noticed that on the three firearms I own equipped with iron sights (10/22, PC Carbine 9mm, Henry BB .357) I have them all adjusted so the rear sight is moving the POA left.
I installed the front sights and rear sights on the 10/22 and the Henry BB so my first thought was that the front sight(s) were not perfectly centered with the barrel. However the PC Carbine's front sight is screwed into the barrel and I also adjusted the factory installed iron sight (rear only) on the Henry BB to move the POA left. So it would seem that even with factory installed iron sights or front sights that are clearly properly centered I shift the POA to the left.

My next thought was that it has something to do with my eyes or perhaps how I'm pulling the trigger (I pull the rifle to the right when shooting and by shifting the irons to the left I account for this).
To rule out it being my eyes I had my wife and a good friend fire the rifles both off hand and from a bench rest. They had no problem shooting a 1" red dot target at 25 yards.
I spent a bunch of time dry firing to see if it is me. As far as I can tell I don't pull to the right, and I don't know if moving the POA left with the irons would even mitigate me pulling the rifle to the right when I shoot.

So what am I missing?
Bullet spin is clockwise so the bullet spins slightly up and to the right?
Is there something about how the brain merges the image from the left eye and the right eye?
Or am I just chasing gremlins?

EDIT: TL;DR
Simply put:
My POA is a 1" red dot at 25 yards. I fire. The POI is two inches right. I adjust the rear iron sight accordingly. I aim for the red dot again, POA and POI match.
This holds true on all the rifles I own. I've had others shoot them to rule out the obvious answer being me, or am I missing something? Why does this happen?

 

[a5werkes]

I missed something.

IF the sights are "adjusted" or set to move POA to the left, why don't the friends point of impact occur to the left of the target?

Then you mention "even with factory installed iron sights or front sights that are clearly properly centered I shift the POA to the left."
Do you mean that when your POA is centered , it results in your point of impact occurring to the left of PO?

Are you right or left eye dominant? causing sighting parallax issues. IF the sights are centered, friends shooting POA-POI, then its you, eyes or trigger pull.

 

[twofewscrews]

IF the sights are "adjusted" or set to move POA to the left, why don't the friends point of impact occur to the left of the target?

When others shoot the POA and POI match up which is why I assumed that the iron sights are on.

Then you mention "even with factory installed iron sights or front sights that are clearly properly centered I shift the POA to the left."
Do you mean that when your POA is centered , it results in your point of impact occurring to the left of PO?

I meant, that on a factory installed rear and front sight, I still end up adjusting the rear iron sight to bring the POA to the left as my POI is to the right of what I am aiming at.

Are you right or left eye dominant? causing sighting parallax issues. IF the sights are centered, friends shooting POA-POI, then its you, eyes or trigger pull.

Right eye dominant. Shooting with both eyes open or one eye only makes no difference.

Perhaps I am being unclear. Let me try again.
My POA is a 1" red dot. I fire. The POI is two inches right. I adjust the rear iron sight accordingly. I aim for the red dot again, POA and POI match.
This holds true on all the rifles I own. Why?

 

[a5werkes]

My POA is a 1" red dot. I fire. The POI is two inches right. I adjust the rear iron sight accordingly. I aim for the red dot again, POA and POI match.

IF you are right handed you are pushing the trigger to the left during the rearward pull. Same as when pistol shooters do it, POI down and to the left.
Close your right hand as if you were holding a pistol and manipulate your trigger finger; watch how the natural joint mechanics drive the finger tip to the left as it moves rearward this is when the rotation of the finger is occurring at the knuckle (M-P) joint. Now keep the first section of the trigger finger perfectly
straight forward and only rotate the trigger pull from the 1st finger joint, then you will get a straight rearward trigger pull.

 

[jdsingleshot]

If you are able to make the sights put the bullet where you want it, just do it and shoot. It's foolish to try to get accuracy to result from some different set of conditions.

 

[Blue68f100]

Maybe a astigmatism problem?

 

[twofewscrews]

IF you are right handed you are pushing the trigger to the left during the rearward pull. Same as when pistol shooters do it, POI down and to the left.
Close your right hand as if you were holding a pistol and manipulate your trigger finger; watch how the natural joint mechanics drive the finger tip to the left as it moves rearward this is when the rotation of the finger is occurring at the knuckle (M-P) joint. Now keep the first section of the trigger finger perfectly
straight forward and only rotate the trigger pull from the 1st finger joint, then you will get a straight rearward trigger pull.

But my POI is to the right of my POA not left of POA (right of target). If trigger control was the issue wouldn't I be shooting low left as you've said, not to the right?

I'll keep a closer eye on trigger control, but I don't know if thats it. When I sight in a rifle with irons, say when switching from Federal to Remington, I fire three or four five shot groups. I then adjust elevation followed by windage. I usually pay alot of attention to trigger control, breathing, positioning, and whatnot when I do this.

When I'm just causually pinking I could completely be guilty of ireggular or poor trigger control, but when Im takeing the time to zero the rifle I always end up shifting the rear iron sight left.

 

[twofewscrews]

Maybe a astigmatism problem?

I do have astigmatism in both eyes, but then when others shoot wouldn't the sights be off for them?
If I'm shifting the rear sight to left to account for my vision (or perhaps trigger control), wouldn't the impacts be to the left of where they are aiming and in order for the sights to work for them I would have to shift the rear sight right?

 

[JohnKSa]

I think it's probably just a coincidence. In my experience, adjustable sights on guns always need some adjustment, you just happened to have 3 that needed to be adjusted in the same direction.

 

[NMexJim]

[How-To] Zero Iron Sights With Ease: Pistol & Rifle

Have new sights but not sure how to use them? We got you! Come learn the ins and outs of iron sights and, most importantly, how to zero them.

www.pewpewtactical.com