Gordon's Reloading Tool

Excellent and incredibly useful for load developement. I've raved about it on here before but a lot of sceptics. I suggest people try it for a few months before passing judgement.

Very helpful for calibers where load data is sparse for new powders. For example, IMR 4451 for 416 Rigby.
 
It ranges from bang on to close for me so far. Some expected results have been way off but generally I find it very useful. Quickload is great too but since GRT is free and easy to install it's what I use.
 
It would be nice if GRT mentioned system requirements somewhere. It looks vaguely like a Windows program? Win 7, 10?

Nowadays it might almost be easier to run as a web app like the Hodgdon reloading data page.
 
It would be nice if GRT mentioned system requirements somewhere. It looks vaguely like a Windows program? Win 7, 10?

Nowadays it might almost be easier to run as a web app like the Hodgdon reloading data page.

GRT is a program that can be simple or incredibly complex. It's all in how you want to use it for whatever purpose. A web based program is unlikely to be able to offer what GRT does. It doesn't require much of a computer to work.
 
I have been using it for about a year, and I find it extremely useful. Predicted velocities and pressures are not far off from reality. It is very useful for cartridges for which published data is scarce or old, such as 9.3x57 or 300 H&H ( I load for both). It is missing data for some newer powders, such as IMR 4955 and 8133 and the odd bullet.
 
I've started to explore the program. So far I like what I see. I'm a little surprised not to find any projectile data for Berry's Bullets. Every other manufacturer seems to be listed.
 
If I get some time, just out of curiosity I was going to build the model for the 30 Newton, and then play around with the program comparing existing test loads/velocity with the program. I'm approaching the end of my shooting life as far as more and more and more new guns and new calibers goes, so I don't actually have a tool like this when I could have sure used one. These days I mostly try to keep all the dust kept shot off the rifles I have.

But... boy, is it complex looking in full on mode!
 
There's a very good support and discussion forum on discord. The developer is on there a lot as are the volunteer developers. It's getting more Patreon users as well so as funding increases so do the additions to the data base.
 
I am so glad I looked at this thread.
I had never heard of this freeware before.

Downloaded it last night.

It is easy enough to use and based on all the variables that it allows the user to input (or change), it is predicted muzzle velocities are "in the ball park." For my 308 load and gun -my actual muzzle velocity is 2,660 fps and the software is estimating 2,689.

It over-estimated by 1% -which is more than reasonable. Who knows, maybe my Magneto Speed is understating the velocity by 29 fps.
 
It would be nice if GRT mentioned system requirements somewhere. It looks vaguely like a Windows program? Win 7, 10?
Nowadays it might almost be easier to run as a web app like the Hodgdon reloading data page.

System requirements are listed under the installation & first start tab.
 
I am so glad I looked at this thread.
I had never heard of this freeware before.

Downloaded it last night.

It is easy enough to use and based on all the variables that it allows the user to input (or change), it is predicted muzzle velocities are "in the ball park." For my 308 load and gun -my actual muzzle velocity is 2,660 fps and the software is estimating 2,689.

It over-estimated by 1% -which is more than reasonable. Who knows, maybe my Magneto Speed is understating the velocity by 29 fps.

If you fine tune everything it can be ridiculously accurate. Sometimes it's not even close though. Some powders and cartridges are especially problematic like most any straight walled magnum and H-110. It says some of my loads are ridiculously high pressure when they clearly aren't. Gotta take the good with the bad I guess.
 
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