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Welcome to the GRT Community site

GRT has 48,802 active users (55,518 total)

I just wanted to reach out and let you know that my husband Gordon passed away on January 19th 2022.

Until further notice, this site stays online. Please note that Patreon contributions have been paused.

Initially, no additional submissions should be made to the GRTLab, or Translations, as no one has access to service the data.
Therefore, it will be impossible to update Powder Models, Calibers, and Bullet to the GRT database as an official release until the possibilities of continuing Gordon's fine work are explored.

Take care!

February 2, 2022 - There are newer updated versions now available to everyone. The Windows version has an End Date for the year 2048.

February 4,2022 - A new Linux version is available today with the end date set to the year 2048 similar to the Windows version.
This version is listed as V2040. It Shows V2040 on the File menu / About screen.
I was able to revive a VMWare Player, Linux implementation, locally after not having used it for a couple of years.
I was able to run the V2040 Linux version on it, and manually advance the system date to Jan. 18, 2046 before I received any out of date message on screen,
so it appears the single byte patch is working. I was able to perform a Save As to a .grtload file, and then open the original file.
Therefore, I believe the patched V2040 version for Linux is working as before.

March 15, 2022 - With the recent influx of new GRT users, a problem has appeared. It seems some email services are trashing the GRT Login Account Verification emails.
The prospective GRT User does not even get the verification email into their Junk/Spam folder as their email service trashes them before forwarding these emails.
GRT Verification emails are addressed as From: Prospective GRT Users need to white list emails from “”.
Affected emails services such as Earthlink, Comcast, Hotmail and ATC Broadband have been noted as problems.
We suggest that if problems of this type are experienced, the Prospective GRT User should get a free Gmail account for registration use.

May 9, 2022 - An additional account start up problem appears to be taking place. Some Users have reported that they do not receive a verification email.
The problem may be that the User is using part of his email address as a Username (i.e. “Gismo” when the User email address is “”)
When this happens, an account is generated, but the User does not receive the confirmation email with password.
Please avoid using any part of your email address as a Username.

Project Relations
Gordons Reloading Tool
Berlin, Germany

Language Dedicated User Groups

If you have a user group or forum dedicated to a specific language, then you can let us know and we will add the link to the list below.

  • The Reloaders Network
  • Precision Rifle Media

GRT simulates the behaviour of a modern nitrocellulose based powder and projectile inside a barrel.

A lot of stunning features for your daily use as a reloader. Yes! The software is free of charge. All you have to do is create a login and download.

Extensive databases help to find the right powder, bullet or caliber specification to build your charge on.

You can add additional information to your load file, like measurements.

GRT can import data from various chono's like MagnetoSpeed, Caldwell, ProChrono, Labradar, PressureTrace II. With Labradar GRT features the tracking analysis diagram which can be displayed too.

GRT lets you overlay a real world pressure measurement onto the simulation diagram!

GRT currently supports the import and overlay of measurements from the PressureTrace II system from RSI.

GRT can analyse and calculate your shot groups!

GRT lets you create a WildCat or a new Cartridge!

GRT is currently available in Afrikaans, Czech, English, French, German, Italian, Polish, Russian and Ukrainian.

Other languages will follow. If you want to help, join our discord server!

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  • start.1652154125.txt.gz
  • Last modified: 2022/05/10 05:42
  • by EWAThoughts