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Old June 29, 2010, 05:41 PM   #1
laserguy
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Join Date: May 25, 2010
Posts: 9
Winchester 52 D, elevation problem

After many many years of searching for a Win. Mod 52 D I finally found one. I had an indoor bullet trap built and have fired the first 50 rounds into it today. However, I cannot seem to adjust the rear sight low enough to get onto the target. Windage is just right but it it is shooting consistently high to the 5 ring.
The rifle has Redfield sights. Is there some way to adjust the sight to shoot lower?
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Old June 29, 2010, 06:08 PM   #2
kraigwy
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Join Date: June 16, 2008
Location: Wyoming
Posts: 9,475
I wouldnt mess with the rear sight. To lower the impact, I would get a higher base for the front sight.

Go to the Brownells website. They have the formula to figure how much you need to come up with the front sight to lower the impact you desire. Then buy a base accordingly.

Quote:
The distance from the bore-center-line – shown running through A and C – to the line of sight
– shown at the tops of the sights -- must be the same approximate distance or height at each sight
location. The rear sight has an adjustment range and you should use the middle of the range as your
starting point for measurements or to determine the correct sight for the rear sight.
Measure the barrel diameter at each sight location – shown at long arrows A and C in the illustration.
Divide each measurement by two to obtain the distance from bore-center-line to top surface of barrel
at each location – represented by the short arrows at A and C in the illustration. Write down and label
your results.
Measure the height of the existing front sight. Add the height of the front sight to its corresponding
center-line-to-top-of-barrel figure to obtain the distance between bore-center-line and line of sight.
The distance between bore-center-line and line of sight (just calculated at the front sight location)
minus the remaining bore-center-line-to-top-of-barrel distance (at the rear sight) will give the needed
rear sight height.
The basic principle is: B plus ½ A (short arrow) is the same total distance as D plus ½ C (short arrow)
OR ½ A + B AND ½ C + D BOTH EQUAL the distance from center line to line of sight.
To measure a rifle barrel for a missing rear sight involves taking three measurements to determine
the fourth measurement. In this example the fourth measurement is the rear sight height.
Barrel Dia. Measurement At Rear Sight .820”
.820” ÷ 2 = .410”
.410” is bore-center-line to top-of-barrel distance
800-741-0015
Determine Rifle Rear Sight Height
brownells.com
Barrel Dia. Measured At Front Sight .596
.596” ÷ 2 = .298”
.298” is bore-center-line to top-of-barrel distance
Barrel Diagram Example With Numbers
brownells.com 800-741-0015
Measure the height of the existing front sight.
Add the height of the front sight to its corresponding
bore-center-line to top-of-barrel figure
to obtain the distance between bore-center-line
and line of sight.
Measure .503”
.298” + .503” = .801”
.801 is the bore-center-line to line-of-sight distance
One half barrel diameter at front sight plus front sight height will give height of sight line above borecenter-
line. Height of sight line above bore-center-line minus one half barrel diameter at rear sight
will give rear sight height
OR
Use the formula for determining rear sight height in this example:
Need to find Rear Sight Height at B (½ C) + D – (½ A) = B
Plug in the words and numbers (½ x .596) + .503 – (½ x .820) = Rear Sight Height
Do the math (.298) + .503 – (.410) = .391 Rear Sight Height
__________________
Kraig Stuart
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071

Last edited by kraigwy; June 29, 2010 at 06:18 PM.
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Old June 29, 2010, 06:20 PM   #3
laserguy
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Join Date: May 25, 2010
Posts: 9
Wow, fast reply. Thanks. I'll go there and give that math a whirl. Right now the rear sight is setting on top of the block, no more adjustment downward. When I was a young lad I never had this problem with my former 52 D.
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Old June 29, 2010, 08:13 PM   #4
laserguy
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Join Date: May 25, 2010
Posts: 9
do you have a link for that formula? I don't see it anywhere on their site.
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