kestrel elite AB MV calibration vs MV table

[rockwind1]

i've done a MV calibration and the dope is usually spot on, but i usually shoot at a nice 70 degrees. if i go up hunting in 25 or 30 degrees, will the calculator realize the MV will probably be less? i guess this is a tough question to phrase, would i have to redo a mv calibration at 25 degrees, would i then have to store it in the table or does it do it automatically? i am running a copper creek 6.5 saum 140 gr berger hybrid, use h1000. not sure how temp insensitive it is. i found something for h4350 saying about 2 fps for every 10 degrees. found a manual on line but it didn't go into the MV table https://kestrelmeters.com/pages/kest...s-basic-manual

 

[_Windrider_]

Do u have the kestrel app?

 

[rockwind1]

i have the kestrel link app, it connects via bluetooth to the elite. i don't use it that much anymore. is there some help there with the mv table and powder temp changes, i mean, i know you can input them there but you can input it in the kestrel as well.

 

[_Windrider_]

i have the kestrel link app, it connects via bluetooth to the elite. i don't use it that much anymore. is there some help there with the mv table and powder temp changes, i mean, i know you can input them there but you can input it in the kestrel as well.

Well here is the thing, it’s much easier to do it via the app. Not only that, the firmware updates through the app.

Right here on this his screen is how you do it

 

[rockwind1]

right, i've used that. it's easier to put in a new profile and i just did firmware upgrade a few weeks ago. so i guess i would have to put in a temp=velocity of around 30 degrees in order for it to include it in a firing solution. i was wondering if it automatically did it somehow. i think i will just put in 30 degrees=10 fps less

 

[_Windrider_]

right, i've used that. it's easier to put in a new profile and i just did firmware upgrade a few weeks ago. so i guess i would have to put in a temp=velocity of around 30 degrees in order for it to include it in a firing solution. i was wondering if it automatically did it somehow. i think i will just put in 30 degrees=10 fps less

There is no way for it to calculate a change in MV based on 1 input. That stuff isn’t linear. The more data points you have the more accurate it will be. There is also an option where you can put in the change in MV per degree.

 

[Saf3sh00t3r]

The only thing it will do automagically is change your firing solution based on DA and Temp at the time. Does that change in velocity less of an issue with less temp sensitive powder or specific factory load? I don't know hence my question.

 

[DocUSMCRetired]

First off never ever use DA, it can be manipulated to read the same DA at different atmospheric conditions that can have an impact on the bullets poi (especially since we are talking temp here).

Also please make sure you have a minimum of 3 inputs on any temp table to ensure quality.

 

[Saf3sh00t3r]

First off never ever use DA, it can be manipulated to read the same DA at different atmospheric conditions that can have an impact on the bullets poi (especially since we are talking temp here).

Also please make sure you have a minimum of 3 inputs on any temp table to ensure quality.

Doc help please...Ok temp table aside for a moment...Is my understanding off in relation to DA and Temp off base?

I ahot assuming the firing solution will change on the Kestrel as temp and DA changes? Is that not the case when the Kestrel is set to "update: yes" as far as the atmospherics?

those changes are on top of the aditonal temp table input? So my Kestrel would automatically change the velocity when the Kestrel reaches that table setting for example or does it average the entries?

thanks!

 

[_Windrider_]

Doc help please...Ok temp table aside for a moment...Is my understanding off in relation to DA and Temp off base?

I ahot assuming the firing solution will change on the Kestrel as temp and DA changes? Is that not the case when the Kestrel is set to "update: yes" as far as the atmospherics?

those changes are on top of the aditonal temp table input? So my Kestrel would automatically change the velocity when the Kestrel reaches that table setting for example or does it average the entries?

thanks!

It averages the entries by calculating a change in FPS per degree, hence why he says use a min of 3 inputs. The reason DA isn’t the best to use is you can get a given DA, say 2300ft from a variety of atmospheric combos. But pressure and temp play roles on ballistics in different ways. Just making up numbers, these are not real, a da that is 2300ft with a pressure of say 27.92 and 65 degrees will have different trajectories than say 26.87 at 93 degrees. Even though both combos equal the same DA. Using DA is perfect for field ref cards, but if you have a calculator, you should use the core components that make DA and input them individually (pressure, temp RH).

 

[DocUSMCRetired]

^ Sums it up right.

 

[_Windrider_]

^ Sums it up right.

Sweet. The seminar is paying off! Learning has occurred.

 

[Saf3sh00t3r]

Sweet. The seminar is paying off! Learning has occurred.

Thank you

 

[devldogs55]

This is something I've been trying to understand as well.... I'm happy the question was asked and answered. I'd like to add on to the original question if I can.

If I shoot at sea level when it's 85*F and humid and get a certain velocity - I'll put it in the MV Temp Table.
If my next data point for velocity is taken at 35*F, but it's at 5,000ft and dry as hell - does that severe change in altitude and atmosphere make the data not useful for the MV Temp Table?

Basically I'm wondering if the temperature/MV data points need to be taken at the same place to be useful?

 

[_Windrider_]

This is something I've been trying to understand as well.... I'm happy the question was asked and answered. I'd like to add on to the original question if I can.

If I shoot at sea level when it's 85*F and humid and get a certain velocity - I'll put it in the MV Temp Table.
If my next data point for velocity is taken at 35*F, but it's at 5,000ft and dry as hell - does that severe change in altitude and atmosphere make the data not useful for the MV Temp Table?

Basically I'm wondering if the temperature/MV data points need to be taken at the same place to be useful?

No. MV is temp dependent, it doesn’t care about elevation. The Change in elevation will affect your drop though as it affects the rate of decay of MV and where the bullet goes transonic, but the initial MV shouldn’t change (theoretically, I’m sure there are slight variations),

 

[devldogs55]

Hmm that makes sense. Thanks for the answer.