Over time there have been several post about surplus rifles shooting high. Many were used with the bayonet attached and sights adjusted accordingly so I thought I would provide tips for correcting this problem.
In the Spring 2011 Issue of the Grand Collectors Assn Journal there is an article regarding the difference of impact while the three different bayonets are mounted on the rifle. Basically it shows that the length of the bayonet and how it's mounted determines if its high or low.
A lot of us collect bayonets but few actually shoot the rifle with the bayonet so we want to adjust the sights to shoot the rifle w/o bayonets.
First we must remember, change the rear sight in the direction you want the impact to go, change the front sight OPPOSITE the direction you want to go.
The question is HOW MUCH? This information is provided by the CMP GSM Master Instructor Program.
It doesn't matter where we sight in the rifle as long as we know 1 MOA = about 1 inch at 100 yards, (1.047) 2 at 200, 3 at 300 etc etc.
We want to know how much to move the sight to adjust for one MOA.
For one MOA the change needed in thousands equals the sight radius divided by 3600 (100 yards = 3600 inches). Sight radius is the distance from the rear sight to the near corner of the front sight.
An example: The 1903A3 has a sight radius of 28 inches. 28/3600 = .00778
So if you are shooting 3 inches high (or low) the sight has to be changed
3 X .00778 = .02334
This works for windage also, depending on the rifle, the front or rear sight can be drifted left or right.
Also depending on the rifle, there are various ways to change the sights to keep the rifle "AS ISSUED", an example on the Springfield you may have to file down or replace the front sight (depending on if its shooting high or low).
On the Mosin 96/30 you can file down the front sight (if shooting low) or grin/mill the bottom portion of the slider on the ladder rear sight.
Hope this helps shooters in shooting these old work horses. (it works on modern rifles also).
__________________
In the Spring 2011 Issue of the Grand Collectors Assn Journal there is an article regarding the difference of impact while the three different bayonets are mounted on the rifle. Basically it shows that the length of the bayonet and how it's mounted determines if its high or low.
A lot of us collect bayonets but few actually shoot the rifle with the bayonet so we want to adjust the sights to shoot the rifle w/o bayonets.
First we must remember, change the rear sight in the direction you want the impact to go, change the front sight OPPOSITE the direction you want to go.
The question is HOW MUCH? This information is provided by the CMP GSM Master Instructor Program.
It doesn't matter where we sight in the rifle as long as we know 1 MOA = about 1 inch at 100 yards, (1.047) 2 at 200, 3 at 300 etc etc.
We want to know how much to move the sight to adjust for one MOA.
For one MOA the change needed in thousands equals the sight radius divided by 3600 (100 yards = 3600 inches). Sight radius is the distance from the rear sight to the near corner of the front sight.
An example: The 1903A3 has a sight radius of 28 inches. 28/3600 = .00778
So if you are shooting 3 inches high (or low) the sight has to be changed
3 X .00778 = .02334
This works for windage also, depending on the rifle, the front or rear sight can be drifted left or right.
Also depending on the rifle, there are various ways to change the sights to keep the rifle "AS ISSUED", an example on the Springfield you may have to file down or replace the front sight (depending on if its shooting high or low).
On the Mosin 96/30 you can file down the front sight (if shooting low) or grin/mill the bottom portion of the slider on the ladder rear sight.
Hope this helps shooters in shooting these old work horses. (it works on modern rifles also).
__________________