Ballistics Solver

Quick start

1. Pick a preset (Load Preset) for a common load, or enter your own bullet below: drag model (G7 for modern boat-tail bullets, G1 for most factory bullets), BC, muzzle velocity and weight.
2. Set your air and wind, your zero, scope height, and how far out to calculate.
3. On a phone or tablet the website solves the sample loads; your own rifle and ammo, spin drift, Coriolis, CSV and printing (marked 📱 APP) are in the Zima Ballistics app. On a computer everything here is open.
4. Hit Calculate → to build the drop table.

Reading the results

• Drop is how far the bullet is below your line of sight, in inches.
• The MOA / MIL / IPHY column is your elevation correction: ↑ means dial or hold up, ↓ means come down.
• Wind is the hold into the wind: → hold right, ← hold left.
• Vel / Energy / ToF / Mach are speed, energy, flight time and Mach number at each range. Orange rows are subsonic.
• Switch on Hear the hit to add a Hear column after ToF: the seconds until you hear the hit, which is the flight time plus the sound's trip back from the target in this solve's own air.
• Use ↓ CSV to download a spreadsheet or ⎙ Print to make a printable range card (on a computer; on a phone they are in the app).

More options

• Metric switch for ranges, speeds, pressure and temperature; everything stays the same underneath.
• Density altitude to enter your air that way, and Zero in different air if you zeroed somewhere else.
• Wind zones (up to three legs along the range) and Wind bracket (± wind), which shows the range of wind holds between a low and a high wind.
• Velocity-banded BC and a custom drag curve for bullets with published multi-point data.
• Height difference sets your shot angle from how far the target is above or below you.
• Tabs for the Table, a Chart, your Corrections at the last row and Stability.
• Want the whole bench with your rifle and optic? Try the Rifle Builder.

This solver downloads the full app engine the first time you open it (a large one-time download, cached after that). The air starts at standard sea-level conditions, not today's weather.