Saved in this browser only. Export to carry them to another device.
Per sessionConditions0 m · 15 °C · 1013 hPa · 50 %
Fills temperature and pressure from the standard atmosphere at that altitude. Standard, or 15° warmer or colder.
Absolute pressure at your position, not the sea-level figure from a weather app.
Advanced. The temperature of the ammunition itself, which is what the velocity correction depends on. Leave blank to track the air temperature — right for rounds that have sat in a magazine, wrong for a box left in the sun.
Positive uphill, negative downhill.
Per rifleRifle & scope100 m · 5.50 cm · 1:20.3 cm
e.g. 0.5 with cm/100 m for a Zeiss Diavari; 0.25 with MOA for a typical US scope.
Per loadBullet & loadG7 0.347 · 175 gr · 884 m/s
Must match the drag model above — a G1 BC is roughly twice its G7 equivalent.
Affects energy only; drag comes from the BC.
Change in muzzle velocity per degree of powder temperature. Leave blank to omit it — modern stable propellants are near zero, conventional ones several times that.
The temperature the muzzle velocity above was chronographed at. Only used when a sensitivity is given.
With the twist rate, enables spin drift. Leave either blank to omit it.
RarelyAdvancedTruing · Coriolis · wind zones · measured curve
Fit the model to a drop the rifle actually produced. This absorbs more error than any refinement of the physics.
Negative below the line of sight, the same sign as the Drop column.
Wind near the muzzle deflects more than the same wind near the target, because it has the rest of the flight to act over.
0° head-on, 90° from your right, 180° tailwind.
Enables Coriolis. Leave blank to omit it; negative south of the equator.
Affects the vertical (Eötvös) term only: east shoots high, west shoots low.
Tiers are ordered by how often the thing behind them changes. Each summary carries its current values, so checking costs no taps.
Full value · 4.5 m/s across
Supersonic to 1200 m · Sg 1.69 · inside the model
At the target
- Drop
- -129.6cm
- Drift
- -32.1cm
- Velocity
- 670m/s
- Time of flight
- 0.65s
- Energy
- 2543J
- Mach
- 1.97
- Spin
- 4.2cm
- Jump
- 5.2cm
- Stability (SG)
- 1.69
Zero elevation 1.20 MIL · above line of sight at 100 m
Trajectory
Corrections are what to dial from the current zero. Rows marked * are transonic or slower.
| Range (m) | Elev (clicks) | Wind (clicks) | |
|---|---|---|---|
| 0 | - | - | |
| 50 | 2UP | 1RIGHT | |
| 100 | 2DOWN | 2RIGHT | |
| 150 | 1UP | 3RIGHT | |
| 200 | 6UP | 5RIGHT | |
| 250 | 13UP | 6RIGHT | |
| 300 | 20UP | 7RIGHT | |
| 350 | 27UP | 9RIGHT | |
| 400 | 35UP | 10RIGHT | |
| 450 | 43UP | 11RIGHT | |
| 500 | 52UP | 13RIGHT | |
| 550 | 61UP | 14RIGHT | |
| 600 | 70UP | 16RIGHT | |
| 650 | 80UP | 17RIGHT | |
| 700 | 91UP | 19RIGHT | |
| 750 | 102UP | 21RIGHT | |
| 800 | 113UP | 22RIGHT | |
| 850 | 125UP | 24RIGHT | |
| 900 | 137UP | 26RIGHT | |
| 950 | 150UP | 28RIGHT | |
| 1000 | 164UP | 30RIGHT | |
| 1050 | 178UP | 32RIGHT | |
| 1100 | 193UP | 34RIGHT | |
| 1150 | 209UP | 36RIGHT | |
| 1200 | 226UP | 38RIGHT |