The Editor, for years a “seat-of-the-pants” target shooter, finds out just how useful a good ballistics software program can be.
A RECENT UPGRADE to the Sierra External Ballistics Software has been released as Infinity V6. This comprehensive ballistics package allows almost any variable to be fed into your home computer to predict weapon system performance anywhere out to 1200 metres. You can choose to use “full metric”, mixed mode (probably appropriate for Australians used to metres mixed with imperial measurements) “full English” for inputs and reports throughout the program. This flexibility is important.
In a most generous and useful application, all commonly available bullet makes, not just Sierra, can be fed in as a variable in the first instance and then you enter other variables like muzzle velocity, barometric pressure, altitude, wind direction, speed and height of sights above bore. Couple this with the ability to enter zero range and point blank range for zero as well as maximum point blank range and you have a doanything ballistics system. Sierra’s database has obviously included the “form factor”, or ballistic coefficient, for all those commonly available bullets to be able to accurately predict their trajectories.
A nice additional feature is the ability to predict foot-pounds recoil from any particular load selected and also to calculate the twist rate necessary to stabilise particular calibre bullets at a given muzzle velocity.
You will end up with bullet height in inches or metric above or below zero at all ranges in 100 yard/metre increments as well as the number of MoA low or high the bullet will strike. This takes the calculation headache out of sight adjustments for the shooter who will be engaging small targets at long range, like your typical varmint hunter.