iStrelok

Ballistic calculator for iPhone, iPad, iPod

Supports metric and imperial units! (yards, feet, inches, etc)
Supports iPhone, iPad and iPod (iOS versions from 3.0)

Field-proven accuracy since 2001

Supported reticles:
MilDot,
NP-R2 (Nightforce),
TMR (Leupold),
NP-R1 (Nightforce),
Ballistic Mildot (Burris),
XTR Ballistic Mildot (Burris),
MLR (Nightforce),
SPR (Leupold),
Ballistic Plex (Burris),
BR (Swarovski),
4D (C2.5-10x50 Kahles),
4D (C3-12x56 Kahles),
LR Duplex (Leupold),
Accu-Range (Redfield),
Varmint Hunter's (Leupold),
ART (Holland),
Rapid Z 1000 (Zeiss),
P4L (Schmidt&Bender),
BDC Standart (Nikon),
NP-1RR (Nightforce),
Boone and Crockett (Leupold),
4A-300 (Swarovski),
MP-8 Dot (IOR),
EBR-1 MRAD f1 (Vortex),
EBR-1 MRAD s1 (Vortex),
EBR-1 MOA f1 (Vortex),
EBR-1 MOA s1 (Vortex),
Mil-Scale MPR (US Optics),
Mil-Scale GAP (US Optics),
Ballstic 2.5-10×42 (Leica),
Ballistic 3.5-14×42 (Leica),
MDMOA (U.S. Optics),
PCMOA Scale (US Optics),
RDP MOA Scale (US Optics),
Rapid Z 800 (Zeiss),
Rapid Z 600 (Zeiss),
TDS-4 (Swarovski),
TDS (Swarovski),
Velocity 1000 LV5 (Nightforce),
DOA 600 (Bushnell),
6-dots MilDot,
Velocity 1000 UHV (Nightforce),
Velocity 1000 UHV5 (Nightforce),
Mil-DotBar 0.5 Mil (Millet),
Mil-DotBar 1 Mil (Millet),
NP-2DD (Nightforce),
Ballistic Plex (2x-7x Burris),
Ballistic Plex (3x-12x Burris),
Dead-Hold BDC dots (Vortex),
Dead-Hold BDC hashes (Vortex),
K-5.56 (Meopta),
TMCQ MOA (Vortex),
TMCQ MRAD (Vortex),
H-25 (Horus Vision),
Enhanced Mildot (Falcon),
ML16 (Falcon)

Frequently Asked Questions (FAQ)

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

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

Q. Would it be possible to support reticle duplex for hunting rifle?

A. Sorry, but duplex reticle has no subtensions, so calculate holdovers is not possible. Without holdovers the presence of this reticle in my program does not make sense.

Q. What power zoom on the scope needs to be used when I use this?

A. Scope manufacturer usually specifies in the manual "power setting for using the ranging features". Use this zoom.

Q. When I close the program, all values revert to default values?

A. Reinstall the program (delete and install again)

Q. I can't find bullet weight? I'm wondering where the input for the caliber, cartridge, and weight of the round are supposed to go?

A. Weight is necessary only to calc bullet energy. To calc trajectory, caliber, cartridge and weight is completely not necessary.

Q. Where is cartriges base?

A. Coming soon.

Q. Which drag function used in the program?

A. G1.

Install

Screenshots

Explanation of terms:

1. Zeroing weather:
Weather at which you zero the rifle (scope) in

2. Zeroing weather: match current weather:
Weather at which you zero the rifle in match the weather you shoot the range
Another words, you zero in the rifle and shoot the range at the same place and time

3. Zeroing weather: enabled (disabled):
If zeroing weather enabled, the program will consider a difference between zeroing weather and present weather.
If zeroing weather disabled, the program will consider that zeroing weather and the present weather are identical.

4. On how many percent bullet speed will change at change temperature on 15 degrees:

Suppose, you have 2 bullet velocity mesurement. 1 and 2 (for different temperatures):
TempDiference = temp_2 - temp_1;
SpeedDiference = speed_2 - speed_1;

TempModifyer = SpeedDiference/TempDiference*15/speed_1*100;

TempModifyer - this is parameter we need for input to my ballistic calculator.
2.5% - this is for very middle quality powder. Best powders can have 1.2 or so.

Here is simple calculator for this purpose

MOA - minute of angle

MIL - miliradian. The miliradian is a measure of angle and there are 6400 of them in a circle.

clicks - clicks of scope knob

Hor. - Horisontal adjustrment

Vert. - Vertical adjustrment

See also: Ballistic calculator for Symbian, Android and Mac OS X

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