kestrel elite 5700 help

[rockwind1]

i have a kestrel 5700 elite ab, sn#2160498. i have down loaded the latest firmware. i have had it for years, i used to be really into the precision rifle stuff. i bought the weather vane for it, etc. but it has always given me problems. but i think i am onto something finally. i've been getting ready for an elk hunt so i've been playing with 5 guns, Defensive edge 338 terminater, a kirby allen 338 ai raptor, 2 different GAP built 6.5 saums, and a Coffin custom 7mm rem mag. all very nice guns. as i was getting re-aquainted with them and trying different ammo, i noticed a pattern that they were all shooting low, .1-.2 mils in the 400-500 yd range, and also shooting low out to 900 yds. finally yesterday, a local dedicated shooter let me borrow his similiar kestrel at the range. i downloaded 3 of my profiles, 6.5 saum, 338 raptor, and 7mm onto his kestrel. i then compared them side by side with the exact same profile. ignoring the wind calls, ( i didn't make the wind the same, only the target distance and direction (395 yds, and 175 deg) as you can see from the pics, his kestrel always had about a .1 mil higher solution,, i also compared all the weather numbers. our weather numbers were kinda close but no where near exactly the same, there has to be some input that is acting on all my profiles to make them shoot low. the weather numbers didn't match but they were close,,, i don't know how important all the weather numbers need to be. pics to follow. mine is the tan one
it has always done this and i usually do a profile calibration with the mv, but i have a nice labradar so i know my ave mv.

any thoughts? i am cross posting this

 

[rockwind1]

weather pics of both kestrels, mine is the tan one

 

[RegionRat]

Maybe I am not following the exact question, but since your wind and weather inputs are not identical, you can't expect the ballistic solutions to be identical.

I'm not sure if we are zooming in on the possible calibration differences between your unit and your friend's unit, or if we are zooming in on how much each weather input can change the ballistic solution?

Having said that, for the examples you are showing at 395 yards, since the wind is different between those two then it explains the difference in the ballistic solutions. ETA: in so many words, you won't get a neutral elevation solution when there is cross wind. The wind value would have to be zero for there to be no effect on elevation. So, if there is a difference in the wind value input between the two units, the elevation will also be different.

I can think of only two ways to dive into what the differences could do to a ballistic solution based on any given difference in those weather inputs. One way would be to use the AB Analytics code and run the inputs parametrically to study the importance of those differences. And.... the second way would be to collect the story in detail and ask them the questions. They have always set me straight when I started using their Kestrel with AB.

 

[Coyotefurharvester]

Could it simply be the way your pressure and altitude settings are configured? No GPS chip, so you have to provide input to get an accurate altitude and pressure. Both of which would alter trajectory calculations.

 

[rockwind1]

Could it simply be the way your pressure and altitude settings are configured? No GPS chip, so you have to provide input to get an accurate altitude and pressure. Both of which would alter trajectory calculations.

i don't know,, i do know the pressure is something that cannot be calibrated, and i just assumed the kestrel measure those things itself. there is a way to set latitude though

 

[rockwind1]

Maybe I am not following the exact question, but since your wind and weather inputs are not identical, you can't expect the ballistic solutions to be identical.

I'm not sure if we are zooming in on the possible calibration differences between your unit and your friend's unit, or if we are zooming in on how much each weather input can change the ballistic solution?

Having said that, for the examples you are showing at 395 yards, since the wind is different between those two then it explains the difference in the ballistic solutions. ETA: in so many words, you won't get a neutral elevation solution when there is cross wind. The wind value would have to be zero for there to be no effect on elevation. So, if there is a difference in the wind value input between the two units, the elevation will also be different.

I can think of only two ways to dive into what the differences could do to a ballistic solution based on any given difference in those weather inputs. One way would be to use the AB Analytics code and run the inputs parametrically to study the importance of those differences. And.... the second way would be to collect the story in detail and ask them the questions. They have always set me straight when I started using their Kestrel with AB.

i guess my question is why am I getting low elevation solutions across several rifle profiles, and the other kestrel is showing a slightly higher solution for the same profiles, i am trying to figure out why. i find it hard to believe the wind difference would affect elevation at only 395 yds. plus, i have 2 wind solutions set in mine, one for 5 mph and one for 10 mph so if that was a consideration, wouldn't the kestrel have to have 2 elevation solutions?

when you say "they", who is that?
i have never heard of ab analytics code. is that in the kestrel?

 

[RegionRat]

when you say "they", who is that?
i have never heard of ab analytics code. is that in the kestrel?

Sorry, I forget myself sometimes and forums can be too full of abbreviations and jargon.

AB Analytics = Applied Ballistics Analytics
You can seek help via the Kestrel customer support numbers or email them those details and they will get back with you.

Cross winds differences show up as elevation due to the spin on the bullet. You get one thing from 3 o'clock, and a different one from 9 o'clock, from the same wind value.

Let me show you an example really quick.
If I take something like a plain old 308 WIN for an example with a 1:11.25 twist
If I set up a profile and use a 175 grain bullet at 2650 fps near sea level....
With a no wind zero at 100 yards, if I apply a full 9 o'clock wind at 5 MPH, the zero goes to -0.21 and if I reverse that wind to 3 o'clock the zero jumps up to +0.21 MOA. So just a 5 MPH full value wind from opposite sides will cause a 100 yard zero deviation of 2X.21 = 0.42 MOA. (0.124 mils)

So, your no wind zero has to be very good, and you can't underestimate the difference that wind and twist makes on full cross reversals. So, even at 100 yards if you try to ignore cross wind values you are setting up a difference.

 

[Coyotefurharvester]

Also the orange unit is set for easy mode, so setup is different between the units. I would expect different solutions. Both units run applied ballistics.

 

[rockwind1]

Also the orange unit is set for easy mode, so setup is different between the units. I would expect different solutions. Both units run applied ballistics.

i did not notice that, thanks!

 

[rockwind1]

Sorry, I forget myself sometimes and forums can be too full of abbreviations and jargon.

AB Analytics = Applied Ballistics Analytics
You can seek help via the Kestrel customer support numbers or email them those details and they will get back with you.

Cross winds differences show up as elevation due to the spin on the bullet. You get one thing from 3 o'clock, and a different one from 9 o'clock, from the same wind value.

Let me show you an example really quick.
If I take something like a plain old 308 WIN for an example with a 1:11.25 twist
If I set up a profile and use a 175 grain bullet at 2650 fps near sea level....
With a no wind zero at 100 yards, if I apply a full 9 o'clock wind at 5 MPH, the zero goes to -0.21 and if I reverse that wind to 3 o'clock the zero jumps up to +0.21 MOA. So just a 5 MPH full value wind from opposite sides will cause a 100 yard zero deviation of 2X.21 = 0.42 MOA. (0.124 mils)

So, your no wind zero has to be very good, and you can't underestimate the difference that wind and twist makes on full cross reversals. So, even at 100 yards if you try to ignore cross wind values you are setting up a difference.

dang,, you are right, i just played with mine. i guess i better go re do that test with the other kestrel

 

[rockwind1]

i did not notice that, thanks!

wait, how can you tell it is in easy mode?

 

[Coyotefurharvester]

I saw the 3:00 on your unit, didn't see the 250* on the orange unit(should be 270 to be same wind direction). If in easy wind would be "none".