Infinity is an exterior ballistics program for small arms. Infinity
is the sixth version of the Sierra Bullets exterior ballistics
program. We believe you will find this to be the most complete
and user friendly ballistics program available. This software
program computes all essential elements of the trajectory, in
1 yard (or meter) increments, of any bullet that has a Ballistic
Coefficient referenced to the "G1" drag function, and
for any set of firing conditions. These firing conditions include
muzzle velocity of the bullet, elevation (or depression) angle
of the gun barrel, altitude of the firing point, wind conditions
at that location, and weather (meteorological) conditions at the
firing time. The trajectory parameters calculated by the program
include velocity, energy, momentum, drop relative to the extended
bore line of the gun, bullet path height relative to the line
of sight of the shooter, wind deflection of the bullet, and time
of flight of the bullet. All are computed versus distance from
the muzzle as the bullet flies downrange. The program outputs
a list of all these parameters and provides graphs, which the
user can select, of velocity, energy, drop, bullet path height,
and crosswind drift.
program does much more than compute bullet trajectories. It contains
a feature that computes the effects on the bullet trajectory of
variations in firing conditions. For example, you can change altitude
of the firing point, and compute the effect on the trajectory.
Or you can change a wind condition; or muzzle velocity; or Ballistic
Coefficient. In fact, you can change any inputted firing condition
or combination of conditions. You can also graph the trajectory
variations that result.
feature of the program is that it will calculate the point blank
range of a cartridge for a game animal or silhouette target of
any size (up to a vital zone of 30 inches (762cm)), for either
of two cases. The first case is when you have already sighted
in your gun for a certain zero range and you want to know how
far out you can shoot at the animal or silhouette without holding
high to compensate for the drop of the bullet. In the second case
the program will tell you where to set your zero range in order
to maximize the point blank range.
also will tell you what happens when you first zero your gun in
at a convenient shooting range, and then shoot at a target that
is either uphill or downhill compared to the slope of the shooting
range where you sighted in. In such a situation the bullet trajectory
will be different compared to the trajectory at the range you
used to zero in. The program calculates the differences in all
the trajectory parameters for you.
of the program will compute where your gun is zeroed if you know
that it shoots high by a measured amount at a known range.
feature calculates the maximum range that a bullet can reach along
a given slope angle. The slope angle can be chosen as positive
(uphill), zero (level fire), or negative (downhill). This feature
also calculates the elevation angle of the gun muzzle (referenced
to level) for the bullet to reach the maximum range along the
will also compute the maximum altitude a bullet can reach, above
a given firing point.
up to five different active bullets at a time. The program stores
a full inventory of bullets and cartridges offered by 15 manufacturers,
both U. S. and foreign. Each of the five active bullets can be
selected from anywhere in the stored inventory list. A key feature
of the program allows any one of several trajectory parameters
to be compared among the five (or any smaller number) bullets
that you select. You can compare remaining velocity, energy, drop,
bullet path height, or crosswind drift. Both a list and a graph
of these comparisons are provided by the program.
You can also
create custom bullets and save the settings in the custom bullet
database. These custom settings function in the program the same
way as the manufacturers bullets. You can save a modification
of an existing bullet or create a custom bullet from scratch.
The custom bullets database is handled separately from the manufacturer's
database allowing future updates of the manufacturer's data without
affecting your custom settings. For more information see Custom
ranges of conditions for many of the data input fields to ensure
that you only enter data which will provide accurate and reasonable
results. For each field that has conditions set, you can see these
required ranges in the status bar in the bottom left of the main
form. If you enter a value outside of these ranges, you will receive
an error dialog box and you must return to that field and enter
a value that is within the defined range.