So I got a Cooey 75, I like to cover the target with my bead. It shoots high at 25M about an inch. With the rear sight on the lowest setting. Its got a .290 height front sight. So I like to get a new front sight that I can shoot on target at 20M so how much taller would I need to drop the POI down to my POA?
Cooey 75 sights izzue.
- Thread starter RobertMcC
- Start date
Go buy a die makers file set, very small files. Deepen the rear sight a tad, it'll work. I doubt it'll ruin the collector value on a Cooey, they get no respect.
I'd posted a question on a Cooey on Sunday, not one answer. Not cool enough I guess
My guess is the hotter ammo of today is flatter shooting as to the root of the problem.
I'd posted a question on a Cooey on Sunday, not one answer. Not cool enough I guess
My guess is the hotter ammo of today is flatter shooting as to the root of the problem.
1. Measure the distance between the front and rear sight....will call this (S) for sight radius.
2. Shoot the gun at a know range and measure the amount of change needed to get the impact where you want it...will call this (D) for the distance from the point of aim.
3. Convert the distance to the target to INCHES..will call this (R) for range.
Now to get where you want the bullets to go:
Divide D by R.
Multiple what ever you got above by S.
Lets run through one. Have a rifle that is shooting 6" high at 50yards. The sight radius is 20". I'd like it to hit exactly on at 50 yards.
1. (S) is 20"
2. (D) is 6"
3. (R) is 1800" (50 yards = 150 feet = 1800 inches)
So D divided by R = 6 divided by 1800 = .00333
And .00333 times S = .0033 X 20 = .0666
(Real world time.... .07" would be close enough.)
Which means that I need to move the rear sight DOWN by that amount to get to zero
or
Move the front sight UP by that amount to get to zero.
(Stolen from w w w.shootersforum.com/rifles-rifle-cartridges/74144-how-figure-out-front-sight-height.html)
2. Shoot the gun at a know range and measure the amount of change needed to get the impact where you want it...will call this (D) for the distance from the point of aim.
3. Convert the distance to the target to INCHES..will call this (R) for range.
Now to get where you want the bullets to go:
Divide D by R.
Multiple what ever you got above by S.
Lets run through one. Have a rifle that is shooting 6" high at 50yards. The sight radius is 20". I'd like it to hit exactly on at 50 yards.
1. (S) is 20"
2. (D) is 6"
3. (R) is 1800" (50 yards = 150 feet = 1800 inches)
So D divided by R = 6 divided by 1800 = .00333
And .00333 times S = .0033 X 20 = .0666
(Real world time.... .07" would be close enough.)
Which means that I need to move the rear sight DOWN by that amount to get to zero
or
Move the front sight UP by that amount to get to zero.
(Stolen from w w w.shootersforum.com/rifles-rifle-cartridges/74144-how-figure-out-front-sight-height.html)
Yeah I bought another with Cooey 82 sights. I might bend down the rear sight back a bit lowering it.
Yeah problem is I cannot move the rear sight down any further so I would need a taller front sight.
That is correct. You asked about how high the new sight should be, and that's how you'd calculate.
