Sight adjustment calculator?

[Bug Splat]

I need to adjust my sights on my CZ97. Is there a calculator where I can put in the variables and get an exact number to adjust to?

[JeremyS]

I doubt it. Barrel fitment can vary by enough that lining up the sights exactly the same way on 5 guns might give you 5 slightly different points of impact. The only real way to get it perfect is trial and error, and the more solidly you can hold the gun while shooting (sand bag to ransom rest) the better. Rear sight moves left = impact moves left, rear sight moves up = impact moves up (and vice-versa for both).

[redcliff]

Actually, I've found this sight calculator works very well indeed: http://www.sdmfabricating.com/sightcalc.html

[JeremyS]

Haha that's pretty sweet! I guess it hinges on your ability to actually measure and move the sight a specific amount and be able to accurately measure how far off they are at a specific distance in the first place. Cool stuff though

[Red Devil]

Simple Math.

The ratio between the amount of desired correction at a given range = the ratio between the amount the rear sight needs to move at the distance from the front sight.

Error/range = Correction/sight radius

e.g.
Glock G23:
- has a 6" sight radius.
- shoots 4" left at 10 yds (30 ft. or 360 in.)

so:

4"/360" = X"/6"

4(6)/360 = X

24/360 = X

X = 0.0667"

(~ 1/16" to the right)

[Bug Splat]

These are new sights that I have had to custom fit. My aim is perfect. The new sights are off.

Thanks for the link Redcliff, thats perfect!

[HighLander51]

It's just a simple triangle ratio. Correcting left/right is easy, just push the rear sight in the direction you want the impact to be. But up/down is more expensive because generally you have to change front sight height. If you are only off 2" high at 25 yards, don't bother. It's only about .5" at 7 yards. Most fronts cost about $45. You never want to be low.

[MossbergMan]

Dang all that math I'm still doing it by eye and by gosh and by golly with handguns.
Thanks for the link Redcliff.

[Bug Splat]

It's just a simple triangle ratio. Correcting left/right is easy, just push the rear sight in the direction you want the impact to be. But up/down is more expensive because generally you have to change front sight height. If you are only off 2" high at 25 yards, don't bother. It's only about .5" at 7 yards. Most fronts cost about $45. You never want to be low.

Sadly I am shooting low so its the front sight I need to lower. Not hard to do but because a mill is involved its measure twice and cut once. I'll do the math tonight and cut tomorrow and try to hit the range Thursday.

Thanks everyone

[HighLander51]

That's too bad you have to cut the front down, it sorta wrecks the sight picture with a low front sight. Don't they have an optional taller rear? Or you could try running a heavier load, like 147's will shoot higher than 115's by a couple of inches.

[speedrrracer]

Dawson Precision has had this info up forever:

http://www.dawsonprecision.com/CategoryProductList.jsp?cat=SIGHTS+FRONT

but they make you do all that scary arithmetic yourself!