DOPE is an RK4 solver with G1/G7 drag models, velocity-banded BC, and custom drag curves. It includes group analysis, a shooting session logbook, stage cards for PRS matches with clock and tally, analytical insights, and tools like a range finder, moving target lead, MPBR, WEZ, and converters. It offers truing at no cost — MV, BC/CDF, and DSF from observed drop/velocity.

FEATURES:

1. Ballistic solver

- Full point-mass trajectory (RK4) with gravity, drag and slope
- G1 and G7 drag models
- BC bands by velocity
- Custom drag curves — Cd/Mach data (ie: Lapua Doppler)
- Come-up/hold in MRAD, MOA, cm and scope clicks, with direction labels
- Shot info: retained velocity, energy, time of flight and Mach at target — transonic/subsonic warning below ~Mach 1.2
- Full range/drop table with toggleable columns
- Interactive trajectory graph — drop/ToF, correction, velocity/energy panels
- Load comparison overlay
- Precision factors (opt-in): MV temp correction, MV-SD dispersion, spin drift, aerodynamic jump, Coriolis/Eötvös, windage zeroing, per-cartridge zero offset
- Runs in-browser and fully offline

2. Equipment management

- Multiple rifles
- Multiple cartridges/loads
- Reload recipe reference
- Bundled bullet library with published BCs
- Holdover reticle view — import and default
- Chronograph sessions data entry and import (Garmin, Athlon, LabRadar)
- Barrel-life tracker
- Cleaning log per rifle

3. Weather & shot inputs

- Automatic weather fetching
- Range-bracketed (zoned) wind
- Standard atmosphere (ISA)
- Coriolis (optional)

4. Zeroing workflow

- Atmospheric Zero — adapted to current atmospheric conditions
- Truing — MV, BC/CDF (velocity or drop), or DSF
- Truing factor display
- Scope click calibration — tall-target test turret correction
- MV-vs-temperature auto-fit from every logged reading
- Ladder test — velocity-vs-charge

5. Groups analysis

- Groups precision analysis — calibrated grid, photo overlay, live ES/Mean Radius/CEP/R95
- Cold-bore and excluded shot tagging
- Shareable links

6. Shooting logbook

- Sessions (DOPE sheet) — date, weather snapshot, hit/miss, corrections
- Session summary — hit %, cold-bore result, point-of-impact bias
- Selectable scaled targets with shot marker — IPSC silhouettes, rectangles, gongs
- Session photo gallery
- LR runs — session aggregate

7. Stage cards

- Planned distances and wind holds
- Auto-filled editable vertical/wind hold
- Full-screen card viewer with color-graduated distance levels
- Past-run logging per stage
- Match type: PRS (par-time + tally), Practice (no timer), or Custom (per-stage / shared overall match clock / no timer; hit-count or points-per-target scoring)
- Export — Print/PDF, CSV, PNG
- Match — group multiple stage cards into one match

8. Statistics & analysis

- Insights — data-driven suggestion cards
- Overview
- Group accuracy
- Precision trend
- By-cartridge breakdown
- Load comparison
- Session hit rate
- Cold-bore analysis
- Wind accuracy
- Call bias
- Position & support hit rate
- MV trend

9. Field tools

- Range estimation
- Maximum Point Blank Range (MPBR)
- Moving target lead
- Hit probability (WEZ)
- Printable zeroing target
- 3D trajectory

10. Converters

- BC from two speeds
- MOA ⇄ MRAD at distance
- Click value at distance
- Slope angle
- Cant error
- Imperial ⇄ metric unit converter

11. Units, data & app-wide

Installable PWA — works fully offline, updates in the background
Optional accounts with multi-device cloud sync (offline-first)
Full JSON backup — export/import your data
Per-quantity metric ⇄ imperial switching; engine always computes in SI
Theme — dark / light / system