Gordon Reloading Tool (GRT)
by Gordon Reloading Tool (GRT)
Description
Unlike simple load tables, GRT simulates the internal ballistics process by allowing users to enter cartridge specifications, propellant type and charge weight, bullet dimensions, and other parameters. It then uses these inputs to project pressure curves and muzzle velocity, helping users evaluate whether a load is within safe limits and how various changes affect performance. 
Available Languages
Afrikaans, Czech, English, French, German, Italian, Polish, Russian, UK
Data Overview
General
| Format | Available as a .zip download. Requires local installation. Supports Windows and Linux only. |
| Cross-device usage | |
| Cloud Backup | (local installation) |
| Price of application | free |
| Price of updates | free |
| Updates | (The last officially published stable version of GRT was released in 2021 (often referenced as the 2021.2030 nightly build). It is indicated that this version will not be further developed in its classic form. ) |
Coverage
| Number of Bullet Brands | 62 |
| Number of Bullets | 4,267 |
| Number of Calibers | 413 |
| Number of Powder Brands | 18 |
| Number of Powders | 249 |
| Number of load recipes | Calculator with an indefinite number of recipe options |
Data Quality and Transparency
| OAL / Seating Depth Stated | |
| Case Capacity Stated | |
| Barrel Length Stated | |
| Load Density Stated |
Additional features
| Load Diary | |
| Weapon register | |
| Velocity Measurement Log |
Calculator options
| Trajectory Calculator | |
| Target Velocity Calculator | |
| Optimal Barrel Time (OBT) Calculator | |
| Parametric Powder Search (PPS) | |
| AI powered Reloading Tool |
Specifics
| Additional info | Had historically an active community supporting the development |
Frequently Asked Questions
No - GRT can oly operate on desktop PCs, preferably with a Windows operating system.
Tha last stable Version GRT 2021.2030.NIGHTLY from 2021 is still available on the GRT Discord server. However, there have been no official bullet, caliber, or powder updates since 2021.
To obtain Gordon’s Reloading Tool (GRT), you first need to visit the GRT Discord server, where the application is provided as a downloadable ZIP file. After downloading, the archive must be unpacked and the application installed locally. A Windows PC is required for native installation.
Running GRT on macOS or Linux is possible only with advanced technical skills, as it requires setting up a Windows-compatible emulation or virtual machine environment. In all cases, GRT remains a local installation on a single computer and can only be accessed from that specific machine.
Personal load data can be saved within a local GRT desktop installation, but it is stored only on the local PC. Sharing this data with other installations or computers is not straightforward. In the event of a system failure or crash, the data may be lost unless a manual backup has been created.