RangeStudio

Modern Exterior Ballistics, Precision Trajectory Engine & Optical Reticle Simulator

Part of the ArmoryVault precision ballistics and cartridge development suite:

• Wildcat Studio — Cartridge CAD & Chamber Dimensions (.wildcat)
• LoadBench — Interior Ballistics, Propellant Combustion & Chamber Dynamics (.loadbench)
• RangeStudio — Exterior Ballistics, Atmospheric Physics, Optical Reticles & Field DOPE (.range)
• ArmoryVault — Firearm & Component Logistics, ATF Compliance & Vault Inventory

---

Capabilities

1. Precision Trajectory Solver: 4th-order Runge-Kutta (RK4) point-mass differential equations solver supporting $G_1$, $G_7$, and custom drag curves.
2. Comprehensive 3D Aerodynamics:
   • Gyroscopic stability factor ($S_g$) using Miller twist formulation
   • Bryan Litz gyroscopic spin drift modeling
   • Aerodynamic jump from crosswinds
   • Coriolis acceleration and Eötvös effect calculated from shooter latitude and firing azimuth
   • Maximum Point Blank Range (MPBR) calculator with customizable vital zone diameter
   • Incline shooting (Rifleman's Rule and Sierra/Litz Improved Cosine methods)
3. Atmospheric Modeling:
   • ICAO and Army Standard Metro models
   • Real-time Density Altitude (DA) engine calculating station pressure, temperature, vapor pressure, and speed of sound
   • Propellant thermal sensitivity velocity corrections ($\Delta \text{fps} / ^\circ\text{F}$)
4. Interactive Optical Reticle HUD:
   • Vector scope simulator with First Focal Plane (FFP) and Second Focal Plane (SFP) zoom scaling
   • Reticle library: Mil-Dot, Horus Tremor3 / H59, Vortex EBR-7C, BDC
   • Turret click solutions in 1/4 MOA, 1/2 MOA, 0.1 MIL / MRAD
   • Moving target leads with crossing angles
5. Printable Field DOPE Cards:
   • Wrist Coach / Armband Cards (3" × 5")
   • Rifle Stock Drop Cards
   • Benchrest Multi-Wind Matrix (5, 10, 15, 20 mph)
   • Temperature Ladder Matrix

---

File Format: .range / .rng

RangeStudio uses the open, structured JSON format with MIME type application/vnd.rangestudio.ballistics+json:

{
  "format": "rangestudio_profile",
  "version": "1.0.0",
  "metadata": {
    "name": "6.5 Creedmoor PRS Match Load",
    "shooter": "Daniel C.",
    "rifle_name": "Tikka T3x TAC A1",
    "optic_name": "Vortex Razor HD Gen II 4.5-27x56"
  }
}

Natively ingests .loadbench / .ldb recipes from LoadBench and .wildcat / .wcs profiles from Wildcat Studio.

---

Precision Firearms Ecosystem

RangeStudio is engineered as part of the unified precision ballistics and firearms management ecosystem:

• ArmsTrader (armstrader.store) — Free web tools and digital utilities suite for firearm owners (Firearm Bill of Sale Generator, Nationwide FFL Finder, Shooting Range Locator, and 50-State Gun Laws Directory). Note: ArmsTrader is NOT a marketplace, broker, or dealer.
• ArmoryVault — High-performance desktop firearm inventory, ATF compliance & vault logistics suite.
• ArmoryVault Companion — Offline mobile firearm barcode scanner and encrypted LAN sync for Android.
• Wildcat Studio — High-performance cartridge CAD, chamber reamer modeling & internal cutaway telemetry suite.
• LoadBench Studio — Industrial interior ballistics simulation, propellant combustion & chamber pressure modeling suite.

---

License

RangeStudio is proprietary software provided free of charge for personal, non-commercial exterior ballistic modeling and trajectory calculation under the RangeStudio End User License Agreement. All Rights Reserved. Reverse engineering, decompilation, unauthorized redistribution, or commercial use without prior written authorization is prohibited.

---

Copyright © 2026 RangeStudio. All rights reserved.