Strelok Pro. Ballistic calculator for Android

Strelok Pro

Ballistic calculator for Android


Supports Android from version 5.
0

This is a smart ballistic calculator. It can use G1, G7 and... custom drag-functions!
Can calculate trajectory without using ballistic coefficient!
Can calculate spin drift, Coriolis effect, gyroscopic stability factor, Coriolis effect and vertical deflection of crosswind.

3846 cartridges database
2465 bullets database + 712 bullets with G7 ballistic coefficients + 459 pellets

You can select reticle from the list (2775 reticles!) and see holdovers (see list of reticles supported)

Supports smart watches with Google Wear OS

Compatible with the Kestrel DROP Wireless Data Logger and Kestrel 5500 with LiNK

Supports bluetooth connection with rangefinders:
Vectronix Terrapin X rangefinder,
MTC Rapier Ballistic Rangefinder,
SHR RF1000,
NTC Tomahawk Rangefinder (or MacKenzie Tomahawk 800B or TOMAHAWK HR-800)

Supports bluetooth connection with Weatherflow WEATHERmeter.

Supports bluetooth connection with Skywatch BL and Skywatch BL1000

Supports bluetooth connection with Calypso Ultrasonic

Supports imperial and metric units.

Field-proven accuracy since 2007

Screenshots

To install, go here: https://play.google.com/store/apps/details?id=com.borisov.strelokpro

Support

Facebook Strelok Ballistics User Group

Getting started

Configuring and tuning Strelok Pro

Reticle view explanation

Using Weatherflow WEATHERmeter

Using Kestrel anemometers

Using Laser Rangefinder

Measuring azimuth for Coriolis effect

Typical errors

Privacy

 

Here is a video from users of Strelok Pro:

 

English language

Hunters, You Need Maximum Point Blank Range! [Strelok Pro] (English)

Стрелба с кант. Strelok Pro Shooting wit ant. (Bulgarian)

Tutorial Strelok Pro en Español (Spanish)

Episode 10: Introduction to Ballistics, calculators and how to set up Strelok Pro. (English)

Strelok Pro Basic Setup How To Guide (English)

How To Get Your Muzzle Velocity Without Using a Chronograph (for airguns)

How To Setup Strelok Correctly (for airguns)

Scope Tape Tutorial using Strelok Pro (for airguns)

Kestrel 5500 & Strelok Pro Balistic Calculator

Scope click validation

Strelok Pro with WeatherMeter and reticle simulation

French language

Tutoriel débutant Strelok Pro (French)

Tuto Strelok Pro fonctionnalité avance (French)

Multi zero strelok pro (French)

Spanish language

Strelok pro. Tutorial (Spanish)

Como verificar el BC con STRELOK PRO (Spanish)

strelok pro como configurar y usar - calculadora balística (Spanish, for air guns)

calcular velocidad y BC sin cronografo - STRELOK PRO (Spanish, for air guns)

Urdu/Hindi language

How to use Strelok pro | Strelok pro Ballistic calculator. Part-1 (Hindi, for air guns)

How to Setup Strelok Pro App for Air Rifle Tutorial | Urdu/Hindi (for air guns)

How to use strelok pro | strelok pro ko kesy istmal krna hy | Urdu/Hindi (for air guns)

How to use (Strelok pro) app in easy way in Urdu/hindi (for air guns)

How To Use Strelok pro Complete Tutorial in Urdu & Hindi

 

Other languages

Configurando strelok pro (Portuguese)

https://www.youtube.com/watch?v=vu1kC8RelfU

https://www.youtube.com/watch?v=3e2S7jMNyjs (German)

https://www.youtube.com/watch?v=ViyPZOb-miY (German)

https://www.youtube.com/watch?v=GtKNL8fVjps

 https://www.youtube.com/watch?v=22FEEkCNP4U

https://www.youtube.com/watch?v=JnZXmwM7vis (Arabic)

https://www.youtube.com/watch?v=qSo6UgP-azo (Turkish)

https://www.youtube.com/watch?v=JHzvI6zu7Mo

 

Frequently Asked Questions (FAQ)

Q. How to account altitude change in Strelok Pro?

A. In Strelok Pro if you measure and enter pressure, humidity and temperature this is enough for trajectory calculation. Altitude changing is accounted in pressure changing
Good reading:
https://www.sierrabullets.com/exterior-ballistics/5-1-effects-of-altitude-and-atmospheric-conditions/
https://www.accurateshooter.com/technical-articles/ballitics-altitude-and-air-pressure/
https://gundigest.com/more/how-to/firearm-training/ballistics-basics-air-pressure-bullet

To account your altitude change, you need:
1. Measure muzzle speed at different temperatures and enter these values to the program as described here: http://www.strelokpro.online/StrelokPro/android/configuration.html
2. Zero your rifle and save zeroing weather conditions
3. Measure weather conditions at place of shooting and enter these values as current weather. Altitude changing is accounted in pressure changing
Density altitude and altitude is not the same! https://en.wikipedia.org/wiki/Density_altitude
There are many combination of temperature, pressure and humidity that will give you the same Density Altitude - but muzzle velocity is also a function of temperature. So, please, don’t use density altitude, but temperature, pressure and humidity


Q. I want to purchase your app for my Android phone, but I know I am going to purchase a new phone in a couple of months time. Can I transfer the app to my new phone with out paying again?

A. Use the same Google account on new phone and you will not be charged twice. See here.


Q. I'm pretty sure I paid for this app before and it's asking to pay again. Is there a reason for that??

A. This is Google Play Store glitch. Try this:
Go to the Settings menu for your device.
Navigate to Applications -> Manage Applications -> All -> Google Play Store.
Tap the Clear Cache button.
Restart the phone and try to install the app again.
Or try this link: https://www.androidpit.com/google-play-not-working


Q. How to transfer my data from old phone (Android) to new phone (Android)?

A. On the old phone. Open Settings screen, open Google Drive screen, make Export rifles
On the new phone. Open Settings screen, open Google Drive screen, make Import rifles.
That's it.

There is another way (recommended):

Create Dropbox account. https://www.dropbox.com/basic It’s free.

1. On the old Android phone. Open Settings screen, open Dropbox screen, make Export rifles
2. On new Android phone. Open Settings screen, open Dropbox screen, make Import rifles.
That's it.

Third way:

Create account on Box.com. It’s free

1. On the old Android phone. Open Settings screen, open Box screen, make Export rifles
2. On new Android phone. Open Settings screen, open Box screen, make Import rifles.
That's it.

And fourth way:

1. Start Strelok Pro on new phone. Open Settings screen, tap folder icon and tap “Backup rifles” button on invoked screen. Locate in internal memory folder StrelokPro with rifles.srl file inside. Possible location: \Phone\Android\data\com.borisov.strelokpro\files.

2. Start Strelok Pro on old phone. Open Settings screen, tap folder icon and tap “Backup rifles” button on invoked screen. Locate in internal memory folder StrelokPro with rifles.srl file inside. Possible location: \Phone\Android\data\com.borisov.strelokpro\files.

3. Replace file rifles.srl on new phone with file from old phone
4. Start Strelok Pro on new phone. Open Settings screen, , tap folder icon and tap “Restore rifles from backup” button on invoked screen. 

 

 


Q. How to transfer my data from Strelok+ (Android) to Strelok Pro (Android)?

A. Start Strelok+. Open Settings screen, open Google Drive screen, make Export rifles
Make copy of the file strelokplus.srl in the Google Drive root folder and rename it to rifles.srl
After this, start Strelok Pro, open Settings screen, tap Google Drive button and make Import rifles from Google drive

Another way:
1. Start Strelok+. Open Settings screen, tap “Backup rifles” button. Locate on sd-card or in internal memory folder StrelokPlus with rifles.srl file inside. Possible location: \Phone\Android\data\com.borisov.strelokplus\files
2. Start Strelok Pro. Open Settings screen, tap folder icon button and tap “Backup rifles” button on invoked screen. Locate in internal memory folder StrelokPro with rifles.srl file inside. Possible location: \Phone\Android\data\com.borisov.strelokpro\files
3. Replace file rifles.srl in StrelokPro folder with file rifles.srl from StrelokPlus folder
4. Start Strelok Pro. Open Settings screen, tap folder icon button and tap “Import rifles” button on invoked screen. Select found Strelok Pro folder and rifles.srl file inside. Tap 'Select this file" button.

There is third way if you have Dropbox account.

Create Dropbox account. https://www.dropbox.com/basic It’s free.

1. Start Strelok+ and make Export rifles to Dropbox
2. Start Strelok Pro and make Export rifles to Dropbox
3. On any device locate file Dropbox/Apps/StrelokPlus/rifles.srl. Copy it to folder Dropbox/Apps/Strelok Pro (Android) to replace existing one.
4. Start Strelok Pro and make Import rifles from Dropbox
That's it.

 

Q. How to transfer my data from Strelok (free version) to Strelok Pro (Android)?

A. 1. Start Strelok, open Rifle screen and make “Export rifles.srl".
2. Locate folder Strelok in internal memory or external sd-card (Possible location: \Phone\Android\data\com.borisov.strelok\files). The file rifles.srl must be in this folder. If cannot open this folder, install  this file browser:  https://play.google.com/store/apps/details?id=com.speedsoftware.explorer&hl=en&gl=US It should be able to read hidden folders
3. Create Dropbox account. https://www.dropbox.com/basic It’s free. Install Dropbox app to you phone
4. Start Strelok Pro. Open Settings screen, tap “Dropbox” button. Link with Dropbox account and make Export rifles. Necessary folder will be created.
5. Open Dropbox app, find Apps/Strelok Pro (Android) folder. Replace file rifles.srl in this folder with file from Strelok (free version)
6. Start Strelok Pro. Open Settings screen, tap “Dropbox” button and make Import from Dropbox
That’s it

Q. How to transfer my data from Strelok Pro (Android) to Strelok Pro (iPhone)?

A. 1. Create Dropbox account. https://www.dropbox.com/basic It’s free.
2. On Android. Link Strelok Pro to Dropbox and make "Export rifles to Dropbox"
3. On iPhone. Link Strelok Pro to Dropbox and make "Export rifles to Dropbox". Necessary folder will be created.
4. On any device locate file Dropbox/Apps/Strelok Pro (Android)/rifles.srl. Copy it to folder Dropbox/Apps/StrelokPro to replace existing one.
5. On iPhone. Start Strelok Pro and make Import rifles from Dropbox.


Q. How to transfer my data from Strelok Pro (iPhone) to Strelok Pro (Android)?

A. 1. Create Dropbox account. https://www.dropbox.com/basic It’s free.
2. On iPhone. Link Strelok Pro to Dropbox and make "Export rifles to Dropbox"
3. On Android. Link Strelok Pro to Dropbox and make "Export rifles to Dropbox". Necessary folder will be created.
4. On any device locate file Dropbox/Apps/StrelokPro/rifles.srl. Copy it to folder Dropbox/Apps/Strelok Pro (Android) to replace existing one.
5. On Android. Start Strelok Pro and make Import rifles from Dropbox.


Q. I have a (Nightforce, Leupold, Bushnell, etc) scope with MilDot Recticle
Is that in your library of recticles? If yes which one would I have to choose and if no is there a chance you could include it in one of your next updates?

A. MilDot - this is standard reticle and it already listed in my program, so you can select from the list reticle with name "MilDot (USMC)" and use it.


Q. I purchased Strelok Pro and it did not install over Strelok (free). How do I transfer all my data from the Strelok to Strelok Pro?

A. 1. Start Strelok and make "Backup rifles". Locate folder Strelok in internal memory or external sd-card. The file rifles.srl must be in this folder.
2. Copy file rifles.srl to Google Drive root folder.
3. Start Strelok Pro, open Settings screen, tap Google Drive button and make Import rifles from Google drive


Q. How do I set your app to accept my 20 MOA base?

A. There is the difference between physical incline of the scope and incline line of view inside of the scope. First depends from base, second - not. It depends only from scope height above barrel and zero distance. If you entered correct scope height above barrel and zero distance, you already accounted your 20 MOA base.


Q. Is there a way to set barrel length?

A. Barrel length is accounted in the muzzle speed value. Longer barrel has faster speed. If you input muzzle speed to the program, it means what barrel length already accounted. Best way is to measure you muzzle speed with chrono.


Q. What is your definition of "scope height"?

A. Distance between center line of scope and center line of bore. Like here.


Q. Could you try to explain how to use "truing" feature?

A. Suppose, you input muzzle speed as 2648 f/s
Shoot at distance bigger than zero distance. Suppose this is 800 yards. Calculated elevation for this distance is 26 MOA
Find out REAL elevation is needed to hit the target. Suppose this is 27 MOA.
On the trajectory validation screen input Distance as 800 yards and Elevation as 27 MOA
Tap button "Calculate" and speed at which elevation will be equal 27 MOA will be calculated. It this case, it will be 2609 f/s
Tap button "Use this velocity" and this calculated speed will replace your current cartridge speed (2648->2609) and screen will be closed.
On the main screen tap "Calculate" button and you will get calculated elevation which equals REAL elevation and equals 27 MOA
Now you can input any distance and hit the target.


 

 

See also: Strelok for iPhone, Strelok for Android and Strelok for Mac OS X

Home page

 

E-mail me: igor.borisov@strelokpro.online (russian, english)