Calibrating DSF on Kestrel Ballistics Meter
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- เผยแพร่เมื่อ 30 ก.ย. 2024
- DSF calibration is important when shooting beyond the supersonic range of a bullet while using a G1 or G7 standard drag model. TIME STAMPS BELOW:
00:06 WHAT IS DSF
Hi, this is Katie from Kestrel and today I am going to talk to you about calibrating your DSF. DSF is your drop scale factor or drag scale factor. We use DSF when we’re going into extreme ranges, when you’re pushing into subsonic. Unlike muzzle velocity, when we give you the number for calibrating your DSF we want you to go beyond that point. We’re going to go through all the steps right now so that you can use this process.
00:28 HOW TO UPDATE ENVIRONMENTALS
STEP 1: First thing we’re going to do is update our environmentals, or atmospherics. We’re going to go down to enviro, toggle over to live, and then swing the Kestrel. Swinging the Kestrel allows ambient temperatures to acclimate to what we we’re actually feeling. So, it allows these sensors to get cleaned out. If you have enough wind flow, you can just hold it up into the air and the air is going to blow past this thermistor. That’s what you’re really looking for. Once you see that your temperature is acclimated, you’re just going to toggle it off to lock. That’s going to lock in all of your environmental conditions for your day of shooting.
01:01 CAPTURE DIRECTION OF FIRE
STEP 2: The next step we’re going to do is capture our direction of fire. You just point the Kestrel down range. Highlight TGT. Red button. And that’s going to capture your direction of fire. Red button again to lock it in.
01:14 UPDATE WIND SPEED
STEP 3: Up next, is updating our wind speeds. Pop open the impeller cover, find the wind direction, and same thing with that shortcut button. Use the red button, lock it in. Give it at least 5-10 seconds to get a good average. And then red button again. That’s going to give us our wind.
01:33 HOW TO CALIBRATE DSF ON YOUR KESTREL
STEP 4: Now, we’re going to go into the gun. Highlight your gun that you’re using. Scroll all the way down through that gun and go to Cal DSF. Center button to go into Cal DSF. Now, the number that it’s giving you up in the upper right-hand corner, is a number that the unit goes into transonic. So, this weapon system goes into transonic at 1525 meters. We actually want to go anywhere beyond that, so we’re calibrating for our drop. Were kind of tweaking that curve at the other end.
02:02
So, we actually have a range here at 1600 meters. I’m going to scroll up to 1600. And my drop is now telling me that it should be at 23.6 mils. So, all I’m going to do is dial up as far as I can on my scope, I’m going to hold up my reticle at 23.6, and then go ahead and fire. We’re looking for confirmation of elevation, not windage. But of course, wind is always a factor at these long ranges.
02:41
So, we just shot out to 1600 and had impacts on 2 of the 3 rounds. Which was really good, we didn’t have to adjust our Cal DSF. Now this happened because I used a custom curve and a known muzzle velocity. I already trued my muzzle velocity, so my curve was really on. If I was using just a G1 or a G7, I would expect to have a greater need for the Cal DSF.
03:03
So, we have a really good chart here that shows you when you really need to calibrate DSF and when you can be most assured that the data that you’re using is going to be good. Anytime that you push out to long range though, I recommend that you take the time to collect your data and collect it on your DSF.
I am confused. You said that the number in the upper right is the distance the round goes transonic and you mention 1525 meters. However the Kestril shows 1068 meters. What am I missing?
Ditto. And the prior video for Cal MV had different readings on verbal, graph and display. Which are correct? The 15% math didn't work out.
Yea same I'm totally lost she says 1525 where did she get that value from when the Kestrel showed 1068 m in the top right corner??
Kestrel - A suggestion. When you are trying to explain how something works, just act like you actually had to make the adjustment and walk people through the last parts of the process vs. just saying "oh, I didn't need to do that anyway..." and then stop showing the viewers how to use the tool. It is literally like saying, "Ok, here's how you press the buttons to measure the wind with a kestrel" and then saying "Oh nevermind, there's no wind today.....but it's SUPER important to measure the wind"
Where's the rest of the video about calibrating?
great vid, MV was pretty straight forward but i often wondered about DSF and this answered all my questions.
I almost decided on not getting one cause i thought it would be to much of a hassle to learn, but these video's help change my mind thank you.
Great vid, well done. If possible, would you mind attaching a link to the chart you referenced at the end of the video. Or let me know what book it is in? Thank you! (did search your site, can't find it)
Hi
Here you go
kestrelinstruments.com/mwdownloads/download/link/id/284/
Thanks for watching.
The Kestrel Team
Thank you! Just got my Kestrel and learning all the different ways to true my data is overwhelming- this helps
Great to hear!
So excited to get my kestrel 5700 elite. It’s been engraved and is shipping. Can’t wait to get lost in all the features
completely useless
Is there any benefit to CAL DSF on a varmint rifle that is never used beyond the transonic range?
There wouldn't be any need to use Cal DSF if you don't shoot into or beyond transonic.
Really nice , this explains a lot.
i was out today with my 338 shooting 1000 yards kestrel said 7.28 mill but that was to high 6.8 mill put me on target do i need to adjust my bc? i was taking my mv as i was shooting with my magnetospeed v3
It depends on whether you are in the supersonic region or transonic region at 1000 yards with that gun. If you go into the Ballistics menu on the Kestrel, you can look at the Rtrans number to know when the bullet gets to transonic. If the bullet is shorter than that range, you need to do a CAL MV (even though you measured it with the Magnetospeed). If the bullet is past that range, then you would do a CAL DSF point.
- Kestrel Team
@@KestrelBallistics ok thank you for the help
This video was helpful. Thanks.
Glad it was helpful!
Love the DSF for trans and beyond. If ones optic had error or a rifle system with axial imperfections, can you use the DSF in the supersonic region to correct for the error? Thank you, I really enjoy your videos.
Hi
Thanks for watching our videos! To answer your question- you cannot use the DSF in the supersonic region. To compensate for a known error with the scope, you can use the zero height (ZH) and zero offset (ZO). Enter these values based on the errors shown in your zero (at 100 yards) and this will propagate throughout the rest of the supersonic region.
The Kestrel Team.
Hello
Just noticed during a channel audit that we left this unanswered. Apologies and hope this helps. DSF is only for transonic and subsonic you should use CAL MV in the supersonic region to help. We are going to implement a Scope Correction Factor in a future firmware update that would also help but we don't have a timetable for that at the moment.
Regards - The Kestrel Team
@@KestrelBallistics as the scope correction been implemented, and if so, when?
@@BobJones-zw3ui Scope Correction has been implemented. It is in the Eunit and Wunit submenu
Very straight forward, as a new owner, to much info in to short time, but on point.
I hope I will get that all in some time.
Didn´t just understand when to do what with the wind and environment, and when to do it again.
Just one dumb question:
Do I have to calibrate the compass every time I shoot, or am I doing it once and it is done for all time?
No dumb questions here. You do not have to calibrate it every time you shoot. You should occasionally recalibrate it though such as if you drastically change locations or every few weeks. If your Kestrel was exposed to a magnetic force, you should recalibrate it. You also need to recalibate it after changing the battery or updating the firmware.
-Kestrel Ballistics team
@@KestrelBallistics Thanks for the answer.
May I ask one more question?
I have calibratetd "Environment" through rotating the Kestrel with the strap and set it on "live".
I have tagged the shooting direction by holding it vertical towards the target.
What am I doing now with the wind?
I can tag it, like the direction, I understand that, but can I measure it "live" too somehow?
And why (when "Environment" is set "live") don´t the measurements change?
Cheers, Ouw.
You need to wind capture as that is not part of the "environment" measurements. Highlight Wind on the menu and point the back of the Kestrel into the prevailing wind. Press the red button to start a capture. Press the red button again to stop the capture. The Kestrel will populate wind direction, average wind speed (W1) and max wind gust (W2). The capture can last as long as you want. Alternatively if you have the weather vane, you can start the capture (red button) and let it go and you will get constant "live" updates of the wind. The environment should be changing to temperature, humidity and pressure changes when set to live. It might not change much if you reached current equilibrium conditions though.
@@KestrelBallistics That is exactly the answer which I´m looking for since two days!
Thank you so much!
Best wishes,
Ouw.
@@Ouwkackemann 7
Were can i find that chart?
kestrelinstruments.com/mwdownloads/download/link/id/284/