Mark/24STR8
While I am always ready to admit to being wrong I usually am correct before I open my mouth on this board. I do not think this time is any exception.
Over the years I've found that there are only about a half-dozen other people who do the same before they start posting like it's as true as if it were straight from the mouth of G_d.
I would put Neil Winston and Pat Ireland in that half-dozen, though I love to nitpick at them both.
Moreover, Neil and Pat are both much, much, more polite than I am. On the other hand, I usually try to limit the bad time I give someone based on their own hubris. Kind of like Simon Cowell and his judging of American Idols I suppose. Since you seem honestly to be having a little conceptual trouble rather than just being a troll (I hope I'm not wrong) I'm going to walk you through why Neil sees your chart as "basically" right while many others (remember, only a handful of people on this board consistently post the right information) think you are mixed up.
In the case above, I think you are almost there but the diagram should have been done in three separate parts to make it easier to understand.
Let's start by imagining we have a gun that shoots 50% of the lead at target breaking distance over your point of aim and 50% under it, on average.
Imagine your shooting eye is 5'6" off the ground and you have a target you are aiming at (your POA or Point of Aim) out in front of you 5'6" off the ground.
You are correct that your shooting eye functions as the rear sight.
So with a 50/50 shooting gun we have a straight line of aim that runs parallel to the ground 5'6" off the ground if our point of aim is the target described above.
Now imagine you raise your comb one inch or any arbitrary amount.
The part of your face holding your shooting eye is raised when you raise the comb so you are raising your shooting, or aiming, eye when you raise the comb.
Take a moment to picture that.
As an easy test if you are sitting at your desk at work, point your left finger with an outstretched arm at a point on a far wall with your non-aiming eye shut and your head forward as if you were shooting. WITHOUT moving your left finger or arm, slightly raise your head -- and aiming eye.
Did you notice that your aiming eye was still focused on the target but your left finger was then left positioned underneath the point you were focused at?
Note that we use our rear sight -- aiming/shooting eye -- in conjunction with the front sight to form a barrel/bead relationship in our peripheral vision correct (while our sharp focus is on the target)? (Hint, the answer is yes.)
So what needs to happen for our front sight to get into a relationship with our rear sight (eye)? We simply need to raise our left finger to once again touch our target.
While I hope you see where this is going, let's now clear some things up that maybe were left out of your diagram.
There are going to be two straight lines we need to think about.
First is the point of aim (POA) line that stretches from your shoooting eye to the front sight and beyond.
The second is the POI line, or point of impact line, that stretches down the barrel, or bore, of the gun and beyond.
The front of that POI line is in the middle of the barrel just below the front sight right? And the rear of the POI line starts right in the center of the primer right?
Going back to our imaginary office target think about the butt stock staying on your right shoulder. You start out with a flat shooting 50/50 gun and reach out your left hand to rest just below a "target" on the far wall.
The next points are the key to the puzzle.
With a 50/50 shooting gun we can assume that the lines for POA and POI run parallel to one another.
But in our example we leave the rear of the POI line stuck in our shoulder pocket right?
Now once we raised the rear sight (eye) we had to raise the left finger to meet up with the target right?
So now we've got a situation where the front sight was raised which raised the front of the POI line!
Get it now? Just in case I'll finish going through it.
We never moved the butt of the gun out of our shoulder pocket right? So that means the start of the POI line stayed pretty much where it was (the shell didn't get raised, our eye, or rear sight did).
But we moved the front end of the POI line (the middle of the barrel at the business end of the shotgun) when we raised our front sight (our left finger in this example).
Now what happens when you move the front of the barrel up relative to the rear? The gun shoots higher of course.
Similarly, what if we kept everything the same at the back end; butt stock still in the shoulder pocket and eye still at the same level.
Now let's lift the front bead up one inch but keep the bore of the barrel in the same spot.
In our office example replace your left finger with your left thumb and reach your arm out and put that thumb under the target.
Now place your left index finger one inch above your thumb but keep your thumb and arm in the same place. The left finger is going to block out or even be above your target right?
What do we need to do to be able to see the target and have the front bead right under the target again?
We lower our left arm until the left finger is just below the target and the left thumb is one inch below the target.
What does that do? It lowers the bore of the gun and lowers the front of the POI line. Remember, our lines pivots on the rear of the POI line which is basically the same because in our example we've agreed that the buttstock stays in the shoulder so . . . it lowers our point of impact!!!
There are numerous folks on this board who have been arguing for years that changing the bead location via adjustable ribs doesn't do anything. They are either crazy, stupid, or "C", all of the above.
I hope these visual exercises help clear this up. Please let me know if you have any trouble following this.
Whatever you do, don't feel bad. Not everyone was a straight A student, and that's okay.
Conceptualizing can be very difficult and I applaud your efforts to understand all this.
Please emial me directly, fatXXXerikcartman@yahoo.com (remove XXX) if you prefer.