Scope click formula.

[fivehole]

Hi,
Does anyone know a formula for working out what the correct click value is.
Mine always adjusts a little bit to much , as an example 20 Moa moved the poi 23” instead of 21” ( rounded numbers).
I have found some information on the internet but I can’t work out how to work out what my turret value really is.
The scope is a nxs with 0.250 moa turrets.
Cheers Neil.

 

[scotch_egg]

Have you measured your zero distance exactly with a tape measure? Then do a box test. I know it might sound pedantic but distance to target is critical.

 

[takbok]

Hope that makes sense:

 

[Gunner223]

If your using a ballistic calculator, can you change the BC of your bullet untill you get the right amount of clicks for the distance.

 

[User00044]

Hope that makes sense:


View attachment 306596

That would be bang on 0.25 moa at 100 metres ?

 

[takbok]

That would be bang on 0.25 moa at 100 metres ?

seems close enough, if the OP was shooting at 100m.

 

[Dunwaters]

That would be bang on 0.25 moa at 100 metres ?

You need to standardise your measurements.
Mixing yards and meters is going to give you a 10% error, which is what you’re experiencing. 1/4 MOA = 1/4” @ 100 YDS only.
When you go to 100M your click values in inches increase by 10%, your scope is American so the values in inches will probably be correct at 100Yds.
An MOA is actually a measure of a segment of an arc spanning 1/60th of a degree, the further out from the centre of the circle you go, the longer the linear measurement of the arc becomes.

 

[jcampbellsmith]

Regards
JCS

 

[User00044]

You need to standardise your measurements.
Mixing yards and meters is going to give you a 10% error, which is what you’re experiencing. 1/4 MOA = 1/4” @ 100 YDS only.
When you go to 100M your click values in inches increase by 10%, your scope is American so the values in inches will probably be correct at 100Yds.
An MOA is actually a measure of a segment of an arc spanning 1/60th of a degree, the further out from the centre of the circle you go, the longer the linear measurement of the arc becomes.

109 yards is near as damn it 100 metres . 0.25 moa is 0.275" , thereabouts at 109 yards .
My point being its possible that the OP has set his rangefinder on metres, in which case the click values are near bob on .

 

[paul o']

Just a 2p worth on what I do to find out drops ! I use a 4 foot section of wall paper and draw a line top to bottom then mark a zero spot one off to one side the other to be used once its zeroed at dead 100 yrds , above this spot I mark off in 1/4" markings lines no dots for around one or two feet or more should you require it. I then fire one round after each click and note how many it takes to arrive at my scope and ammo combo and use this as my scope info! I do this to my max range for hunting and compare this to a well known App as i also chrono there normly within a range for a small shot at the range i'v decide as max .
around the turret a wrap of 1/4 dino tape this is used with my clicks added in black as a quick guide from 0 to 400 at 25yrd drops in red dots..

 

[Bowland blades]

Bit more to it than just range and minutes are not 4 clicks are =1" . A minute is 1/ 60th of a single degree.
wind over contours etc will change your elevation and many other environmental factors . Any chart should be interpreted factoring in conditions . Marking turrets for accurate longer range targets is mainly a WFT

 

[Steff]

A classical example of the fact that the internet cannot replace a sound school education. Basic math.

Teacher tone off.
For practical advice there‘s some missing info.
Are you talking about MOA in its correct meaning, .i.e. a measurement of angle, or as a replacement for inches?
At which distance are you seeing this?

 

[fivehole]

Hope that makes sense:


View attachment 306596

Cheers mate, just what I was after.

 

[fivehole]

Thanks for your reply’s , it was at 107 yards and after the box test it returned to within 1/2 “ of the first shot but I thought it was moving a bit too much hence why I was after the formula.
On a similar note is it better to adjust the bc or speed using StrelokPro.
Cheers again Neil.

 

[fivehole]

That would be bang on 0.25 moa at 100 metres ?

Cheers, it was at 107 yards (98 meters) . Could it be that night force use meters?

 

[fivehole]

Regards
JCS

Cheers, I’ve seen the video but I couldn’t work out how to work out how to convert it to my click value.

 

[User00044]

Cheers, it was at 107 yards (98 meters) . Could it be that night force use meters?

That wasn't quite what I meant . It just seemed a coincidence that @takbok 's calculation equated to 1/4MOA at 109yards / 100 meters. I thought perhaps you'd ranged in meters instead of yards in which case the click values were within 0.002 of a 0.250 MOA .
It's an American scope , doubtful they'd calibrate using metres , especially given its MOA .
If you're using StrelokPro , get a good zero and validate velocity at 300 or 400 yards . You need to enter accurate measurements . Then check at various distances.

 

[ejg]

Cheers, it was at 107 yards (98 meters) . Could it be that night force use meters?

Have another close look at the vid of Bryan Litz. All you are looking for is described. I don't think there is much wrong with your scope, you just need to shoot at 100yds.
edi

 

[fivehole]

Just done the ladder test at 100 yards ( measured with range finder)
27 moa moved the impact 29” which is a lot closer to where it should be.
Perhaps the extra 7 yards makes a difference.

 

[Steff]

Just done the ladder test at 100 yards ( measured with range finder)
27 moa moved the impact 29” which is a lot closer to where it should be.
Perhaps the extra 7 yards makes a difference.

Basically you are spot on with 1 MOA being ~1.047" at 100 yards.
27 x 1.047 = ~28.27