Rifle Scopes Input wanted on boxtest (tall target) results

[SWE_Patrik]

Hi!

Much appreciate som thoughts on the results from my first boxtest on my new Razor AMG mrad version. The box was mounted with a plumbline and measured distance between the dimonds
(300mm horizontal and 210mm vertical). Dubble checked turret settings each time (3.0 side and 2.1 vert), distance was the 100m line on my local range. I have not verified the range but target was on the normal stands.

Will shoot it again, but my inital fear is that the horizontal clicks are off by almost 10% ....

Or am i worrying needlessly?

 

[kansas]

I don't shoot box test anymore because of the results you are seeing. You need to take a look at Killshots scope test and try to duplicate it best you can. By shooting the targets you are introducing human error. Not knocking your shooting ability, just fact. I don't have a setup like KS but I've measured, with a tape, 50 yards exactly and strap my rifle in a gun vise to perform my tall target test. Works fine.

 

[supercorndogs]

Hard to say without having a reticle to measure how far apart the dots are. Were the diamonds exactly 3 mils apart?

 

[EXTREMEPREJUDICE]

If your reference measurements are indeed correct and a stiff wind didn't pick up between your vertical and horizontal shots, or you didn't suddenly start pulling to the right.........................yes I would agree it appears your wind-age turrets are off.

 

[SWE_Patrik]

Hard to say without having a reticle to measure how far apart the dots are. Were the diamonds exactly 3 mils apart?

Yes when i measured with the reticle on the diamond left of POA, it lined up perfectly with 3.0mrad. The hits are about 2.5cm right of the diamond which translates to 2.75mrad or 9.2% difference...


I think i will shoot a another box with larger target for the horizontal plane, say 100m and 7.0mrad or so with dots in between.

 

[kansas]

Good luck but trust me...it ain't likely the scope.

 

[Lowlight]

When doing a box test or tall target test, you want a minimum distance of 10 Mils or 36 Inches covered.

You need to go more so the errors compound enough to be noticeable. If you have a small error, the close distance will not show it. it will still be within your personal accuracy standards. (Say you are a 1/2 MOA shooter, the errors have to be bigger than that in order to know it's the scope and not the shooter.

The no shoot tests that lock the scope down and provide a stable platform for tracking help to isolate the scope vs incorporating shooter error

Go big when doing a tracking test, inside 10 mils you are not gonna see much

 

[SWE_Patrik]

Update: Shot at same range (100m line) yesterday with a larger box. 100cm vertical and 50cm horizontal (since i only have 5.0mils windage), so 5.0mils and 10.0mils.

Results:
1st: dead on POA
2nd: 48cm left
3rd: 49cm left and 93cm up
4th: 0cm side and 93cm up
5th: back on POA, same hole as starting shot

So now i´m starting to wonder/worry. Ofc the horizontal is within margins of me shooting but 0.7mils off on the vertical that is something else.

Next step is to measure distance from line to targetstands with 50m tapemeasure and shoot the box again with two evolutions instead on just one go around.

I can´t belive this scope might be that faulty, gotta be something else .....

 

[CharlieNC]

So what is the dispersion if you shoot 10 shots on a dot drill? That is a reflection of the inherent variability of the system, including equipment and shooter, and unless the scope changes exceed this variability then you can't infer a scope issue.

 

[blackblue]

Send it to Killswitch.

 

[SWE_Patrik]

So what is the dispersion if you shoot 10 shots on a dot drill? That is a reflection of the inherent variability of the system, including equipment and shooter, and unless the scope changes exceed this variability then you can't infer a scope issue.

Right i´m shooting atleast once a week and i´m grouping 10 shots inside 30mm at a 100m. So nowhere near explaining the somewhat consistent results so far.
I´m gonna measure the exact distance on my 100m range next.

 

[pell1203]

SWE_patrik, are you certain the "100 meter line" on your range is actually 100 meters?

For example, if you had incorrectly assumed it was 100 meters and it was instead a 100 yard line, your test would have been actually shot at 91.44 meters. Theoretical results for a 100 yard line test dialing 10 mils of vertical and 5 mils of windage, yield a vertical spread of 91.44 cm and a horizontal of 45.72 cm. This brings both your results of 93 cm vertical and 49 cm horizontal within limits of shooter/wind error and somewhat reinforce the possibility that your distances to target may not be accurate.

Bottom line is, until you have an accurate measure of distance to target, everything else is just a guess.

 

[earthquake]

You need to measure the distance perfectly with a tape....to within an inch or so. (It makes a difference)
I use a similar setup as KSE, heavy piece if I-beam, one piece scope mount and a Horus CATS target. I set up at exactly 100-yards measured with a non stretching steel tape. The scope does NOT move.
I use plumb-bob's and levels to square it all up. I feel it's the only way to be sure in measuring the mechanical of the scope w/o the human factor.

 

[SWE_Patrik]

Update!

I shot a new talltarget test with vertical only and measured the range with a steel tapemeasure. Turns out our 100m line is only at 95,5m and that squares up really well with my earlier results

Distance: 95,5m
Elevation on turret: 7,5mRad
Actual bullet impact: 0,717m
Deviation in % from expected result: 0.105%


Earlier box test posted above
Distance: 95,5m
Horizontal adj. on turret: 3.0mRad & 4.2mRad
Actual bullet impact: 0,2831m (side) & 0.40371m (vertical)
Deviation in % from expected result: -1,19% horizontal & 0,651% vertical

So life is good again and everything is on par for my PRS-match this weekend!