An app by JS IT ApS
Internal ballistics for precision handloaders.
TRT (Torben's Reloading Tool) models your load from the inside out — calibrated powder data, charge-ladder simulation, and optimal barrel-time analysis — so you can develop accurate, repeatable loads with confidence. For iPhone, iPad, and Mac.
Coming soon to the App Store
Calibrated load data
Powder parameters fitted to published manufacturer data across multiple cartridges and powders, kept current through the app.
Charge-ladder modeling
Simulate velocity and pressure across a charge range, with clear flags when a load becomes compressed.
Optimal barrel time
Barrel-time analysis to help you find the accuracy nodes that matter for your rifle and components.
Built for the field
Your data works fully offline at the range — no signal required once it's on your device.
Safety first
TRT is a tool to help you understand and develop loads — it is not a substitute for published load data or sound reloading practice. Always cross-check against current manufacturer data, work up loads carefully, and never exceed published maximums. You are responsible for the safety of every round you assemble.
About
TRT is developed and published by JS IT ApS, a Danish software company. We build focused, dependable tools for people who care about precision.