Guides
Everything here explains a number the calculator prints. No filler, no theory you cannot use on a range day.
G1 vs G7 drag models
Which coefficient to enter, why the two numbers differ, and exactly how this calculator converts a G7 BC.
Atmosphere and air density
Station pressure versus a sea-level altimeter setting, and how altitude, temperature and humidity move your drop.
Reading a DOPE card
MOA, mils and turret clicks, and how to check a card against real impacts before you trust it.
Point blank range
What MPBR actually promises, how vital zone size changes it, and when a plain 100 yd zero is better.
Recoil energy
Free recoil versus felt recoil, why powder charge matters, and how to compare two rifles fairly.