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Discussion in 'Sights, Optics and Lasers' started by CaptainXL, Oct 12, 2011.

1. ### CaptainXL

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A couple of years ago I ran across a gunsmith who had computer software that would calculate how much a rear sight had to be moved to effect bullet impact at a given distance. He would input the sight radius of the pistol, the distance (R or L) that the impact needed to be moved and the exact distance at which the group was originally shot at.

I have done a lot of searching online for a software like this but can't come up with anything like it. Does anyone know of such a software? If you do know --- Name of software? Where to get software? Price?

2. ### G19aps

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Ameriglo has one on their website hard coded for the different Glocks. Maybe you could ask them what they use.

3. ### Brian LeeDrop those nuts

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Up a tree.
I doubt there are many people making such software since you can already calculate sight adjustments in about 30 seconds with a 4 function calculator.

You just compare the distance you are shooting at, with the sight radius of the gun. OK, so let's say you are shooting at 7 yards and the distance between the front & rear sights on your gun is six inches. You sight radius is exactly 1/42nd of the distance (7 yards) you are shooting at. OK, so your groups are 3 inches to one side? Divide 3 inches by 42 (which is .071") and move the rear sight to one side by that amount.

Job done.
Money saved on software, now diverted to a beer purchase.

4. ### CaptainXL

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Thank you G19aps and also Brian Lee.

After writing the post I did a little thinking and came up with two different formulas that can be used to calculate the sight adjustment distance. You need to know the sight radius, shooting distance (in inches) and the amount that the shot groups are off.

I did not know about the calculator on the Ameriglo website. The Ameriglow website has the sight radius already determine for each model of Glock and automatically calculates shooting distance in feet into inches. The Ameriglo website determines how much taller or shorter your front sight needs to change. However, the same resulting value can be used to determine how far to move your rear sight.

A=Sight Radius B=Shooting Distance (in inches) C= Shot Group Offset

Here are the two formulas:

#1 -- A divided by B times C -- A/B x C = The Distance to move rear sight.

#2 -- C divided by B times A -- C/B x A = The Distance to move rear sight.

(Move your rear sight in the same direction that you want your shot group to move. If you want to move your shot group to the right -move the rear sight to the right.)

Now that I know about the Ameriglo website I won't need to make any calculations.

Thanks again to both of you for the input.

Last edited: Oct 13, 2011
5. ### bustedkneeThe Snowflakes have invaded GT

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I don't see the point.

I have run into more than a few shooters that can't figure out which direction to move the sight!

Even using a scope with graduated clicks it is not always correct. Too many other variables.

Besides, I find shooting to be fun.

6. ### CaptainXL

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I too enjoy shooting, especially when I hit where I aim. The POINT IS to hit where your aiming. That does make it more fun that just pulling the trigger and going bang.

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