Glossary
These are the most common terms you will see while building profiles, reading solutions, and reviewing charts.
Density altitude describes how dense the air behaves. It gives you a fast way to understand how the atmosphere is likely to affect drag and bullet flight.
Muzzle velocity is the speed of the bullet as it leaves the barrel.
Time of flight is how long the bullet takes to reach the target.
ES and SD
Section titled “ES and SD”Extreme spread is the gap between the fastest and slowest shot in a string. Standard deviation shows how tightly grouped your shot speeds are around the average.
MOA and MIL
Section titled “MOA and MIL”These are angular units used for scope adjustments and holds. Your profile and your optic should use the same unit system.
A hold is the amount you aim above, below, or beside the target instead of dialing the turret.
DOPE stands for the data you keep on your rifle, load, and corrections at distance.
Your zero is the distance where your point of aim and point of impact match.
Ballistic coefficient describes how well a bullet resists drag compared with a standard model.
Drag value
Section titled “Drag value”This is the drag input your profile uses to help predict bullet flight. It can be refined later if your real-world results show the need.
For more context, see Zeroing and Muzzle Velocity and Environment and Atmosphere.