K31 with Swiss Products Diopter

Zedbra

Zedbra

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So I "worked from home" today and ended up at the range for lunch. Huh. Imagine that - so I managed to finally try my K31 that I set up with a diopter and so far I quite like the set-up. However, it seems that I am shooting high at 100 metres without messing with intentionally holding low, making it difficult to repeat. The diopter is twisted as low as it can go but I am still shooting high - are there adjustments or modifications that can be done to correct the height or do I just have to learn how to shoot with the diopter as-is?

K31 with Swiss Products diopter sight system.







First 100 metre target with diopter - 5 shots on 7"x5" target.




100 metre target with diopter - 10 shots on 7"x5" target. I can't seem to get the shot down without adjusting holdover low.

 
Mines right on with adjustment to spare on the low side , I wonder what sliding the diopter forward would do . Mine was set when I got it so I haven't played with it much yet . It goes to 300 and back though
 
I've had a Swiss products diopter on my k31 for Two years now and at first had great results at 100 and beyond. I put the rifle away for a year and just took it out recently had the same issue, all my rounds were high even after completely maxing out the elevation adjustment. I haven't investigated any further since with a lack of time to do so but if and when I do I'll let you know.
 
After maxing out elevation? You mean down ?
I wonder if it's the way you hold . I have instructions from Swiss products that say POI will change with cheek weld and diopter setting , I thought that made sense but I was thinking longer range than 100 yds
 
How are the Swiss Products elevation adjustments marked? The St. Marie are marked T (Tiefe - Low) and H (haupt - high), and you adjust to correct where the shots are hitting. For example if you are shooting low then you would adjust towards "T" to correct, simliarly with windage if you are hitting to the left then you adjust towards the "L" (links - left).
 
How high?
In inches

Please check the iris. Is there a flange nut touching the opening for the iris block?
If there is a flanged nut, it should be taken off.

If there is no flanged nut, you'll need to add a shim between the top of the barrel and the front sight.
In other words, raise the height of the front sight to lower barrel angle to the sights.
A 0.015" metal shim will lower the impact about 2" at 100yds. Soda Can thickness.
Can also get brass shim from hobby stores.

Some rifle/shooter combinations have caused this situation. Not everyone can shoot a rifle sighted in for someone else, otherwise would not need different front sight heights.

Changes in POI can happen with humidity changes affecting the stock along with action screws loosening.

Sling barrel band should be loose enough that the spring detente moves freely without binding.
Front barrel band just tight enough to hold upper hand guard from sliding forward.
Front action screw should be tight.
Rear action screw can be played with, torque wise, to find what tension gives tightest groups. Will change POI too, to some extent.

Swiss Products diopter knobs are marked U for up and L for left, adjust to where you want impact to go.

The original Swiss W&F diopters adjust, like all German Target sights with the word "bei" on them.
Meaning 'By" where the shot was. EG shot at 12 o'clock = adjust shot in direction H = high= German Hoch
T= Tief= low
L = Links = left
R = Recht = right

Changing your check weld position will also affect POI.
 
Last edited:
diopter said:
Sling barrel band should be loose enough that the spring detente moves freely without binding.
Front barrel band just tight enough to hold upper hand guard from sliding forward.
Front action screw should be tight.
Rear action screw can be played with, torque wise, to find what tension gives tightest groups. Will change POI too, to some extent.

Swiss Products diopter knobs are marked U for up and L for left, adjust to where you want impact to go.

The original Swiss W&F diopters adjust, like all German Target sights with the word "bei" on them.
Meaning 'By" where the shot was. EG shot at 12 o'clock = adjust shot in direction H = high= German Hoch
T= Tief= low
L = Links = left
R = Recht = right
Click to expand...

Thank you, this is what I was trying to say.

I blame the first week at a new job!
 
By the way, use round black targets for easier centering of the sights. Most of your vertical stringing is caused by the oval target,
A black center diameter of around 7 inches is best for 100 yds/meters shooting with diopters
 
I'll look into 7" circular sights, Carlos. I do like the orange center, I was lining up the cross hairs of the front ocular with that line - and with no more down adjustment on the Swiss Products sight, I don't want to conclude it is the target's fault just yet (maybe it's me?).
 
Ruler, compass, razor and black cardboard.
Maybe cut out a 1 or two inch hole in the middle for the white background to show through.
NRA 20yds or 25yd pistol slow fire targets work also.
 
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