ApexLOAD PRO vs. QuickLoad vs. GRT

Which Ballistics Software Is Best?

Overview

This article compares ApexLOAD PRO, the original QuickLoad, and Gordon’s Reloading Tool (GRT)—three well-known internal ballistics software solutions used by reloaders to predict pressure, velocity, and trajectory behavior.

ApexLOAD PRO is a modern, premium internal ballistics platform designed to continue the legacy of established ballistic software while addressing today’s technical and usability requirements. It combines a continuously updated proprietary database with browser-based access, cross-platform compatibility, and integrated internal and external ballistics calculations.

The original QuickLoad by Hartmut G. Brömel

The original QuickLoad, developed by Dipl.-Ing. Hartmut G. Brömel (Germany), was a pioneering internal ballistics simulation tool. It allowed reloaders to model chamber pressure, muzzle velocity, and the effects of changing bullets, powders, case capacity, seating depth, and barrel length. Its companion module, QuickTARGET, added external ballistics and trajectory prediction using common drag models such as G1.

QuickLoad included an extensive built-in database covering hundreds of propellants, thousands of bullets, and a wide range of cartridges. It was widely regarded as technically deep and scientifically sound. However, it is a Windows-only desktop application, reflects legacy design constraints, and has not received updates since version 3.9 (2022). As a result, parts of its database no longer reflect current production components.

Gordon’s Reloading Tool (GRT)

Gordon’s Reloading Tool (GRT) emerged as a free, community-driven alternative to commercial internal ballistics software and gained popularity among hobbyist reloaders. It offered a modern interface and focused on internal ballistics modeling, including chamber pressure, muzzle velocity, and harmonic behavior through Optimal Barrel Time (OBT) calculations. GRT supports Windows and Linux (macOS via Wine) and relies heavily on community-contributed chronograph and load data.. 

GRT is appreciated for its accessibility and modern approach. The accuracy of its results depended strongly on precise user input. Following the death of its founder in 2022, development stopped entirely. 

What Is Ballistics Software?

Ballistics software is a simulation tool used by reloaders and shooters to predict how ammunition behaves before firing a shot. It calculates internal factors such as chamber pressure and muzzle velocity, and often external factors like bullet drop, wind drift, and trajectory. By modeling these variables digitally, users can develop safer, more consistent, and more precise loads while reducing trial-and-error at the range.

How Does Ballistics Software Work?

Ballistics software uses mathematical and physical models to simulate the combustion of powder, pressure buildup, bullet acceleration, and flight behavior. Users input cartridge, bullet, powder, and firearm data, which the software processes using calibrated models and databases. The results estimate pressure curves, velocity, and—when supported—external trajectory, helping users evaluate load changes before real-world testing. (see also Wikipedia

Why Choosing the Right Tool Matters

In precision shooting and advanced handloading, internal ballistics software is no longer optional—it is essential. These tools help reloaders estimate pressure limits, velocity, and burn characteristics before firing a single round, reducing risk and improving efficiency.

For many years, QuickLoad was the industry standard. GRT later introduced modern concepts and accessibility. As of 2026, however, both legacy tools are effectively discontinued, either due to lack of updates or complete shutdown.

The Role of ApexLOAD PRO

ApexLOAD PRO builds on the foundational work of its predecessors and carries their legacy forward. It is a web-based, device-independent internal ballistics platform designed for modern reloaders, offering a continuously updated database, modern computing infrastructure, and integrated internal and external ballistics tools.

ApexLOAD PRO vs. QuickLoad vs. GRT – Side-by-Side Comparison

Why Professionals Chose the Original QuickLoad

Despite its aging interface, QuickLoad remained the gold standard for many years due to its unmatched database depth at the time, algorithms validated by decades of practical use, and professionally curated data that did not rely on community uploads.

The Legacy Continues with ApexLOAD PRO

With both QuickLoad and GRT no longer actively maintained, ApexLOAD PRO was developed as a modern successor. It offers a continuously evolving database, active development, and an expanded feature set that includes calculation history, a structured load diary with weapon assignment, and velocity-targeted calculations commonly used for subsonic or application-specific load development.

Frequently Asked Questions

Q: Is Gordon’s Reloading Tool (GRT) still available?
A: Yes. The official download site is here, but no updates have been released since 2022.

Q: Is the original QuickLoad still available?
A: No new versions are available. Version 3.9 (2022) is the final release, though some dealers may still have legacy licenses.

Q: Does QuickLoad offer free updates?
A: No. Updates historically required additional payment, and no updates have been released since 2022.

Q: Does ApexLOAD PRO include updates?
A: Yes. The annual subscription includes continuous database and feature updates. Users may suggest new items for inclusion.

Q: How comprehensive is the ApexLOAD PRO database?
A: As of January 2026, it includes 431+ calibers, 4,644+ bullets, and 249+ powders, covering major manufacturers and nearly all CIP and SAAMI-registered calibers. You can review available calibers and bullet and powder brands online.

Users can test ApexLOAD PRO with full functionality. Each account includes 8 free calculations before a subscription is required.