Gordon Reloading Tool

[xcudlaty]

Wonder if anybody using GRT https://www.grtools.de/doku.php what your thoughts about it? I mean how reliable is it ?

[dromia]

Looks like a prediction tool like Quickload.

Always start with and remain within published data, such programmes are just predictors and not a reliable source of loading data.

Can be interesting to play with but the output is only as good as the data input.

[ukrifleman]

Wonder if anybody using GRT https://www.grtools.de/doku.php what your thoughts about it? I mean how reliable is it ?

At best educated guesswork, not hard data.
As dromia says, stick with published load data.

ukrifleman

[xcudlaty]

I always checking with manufacturer data. I've just compared load data from Reload Swiss website with GRT for RS50 39gr with Sierra 168gr HPBT match king, results are similar. but In GRT I got my barrel details , and standard values for rest of parameters. Would anybody be so kind and compare it with quickload please ?

Cheers

[dromia]

Binned my Quickload years ago when I moved to Linux OS, never missed the damn thing, like most things internet they only serve to suck your life away.

At best the programme will have the manufacturers average specifications of your barrel, not the current spec of your barrel, another approximation.

[xcudlaty]

Even if its only manufacturers specification, what else You can get?

Always start with and remain within published data

sorry You contradict yourself.

Even If those databases are only manufacturers info its still easier to use it as guidance than look all over websites and try to find anything. Of course You need keep eye on signs of overpressure, check velocity of your loads etc. But at least You got some point to start with.
With new load I always start with very low amount of powder and step up 0.2 gr until get some good results. It's more time and work consuming way, but safer.

[dromia]

Exactly that is all you can get so limits the efficacy of the tool.

I see no contradiction, explain!

No need to trail the internet just go to your powder manufacturers site which will give maximum and minimum loads.

Eye for overpressure, I suggest reading the sticky on this subject.

[xcudlaty]

Got to apologize, You was about barrel data. my fault. Anyway conclusion is program is not reliable, got it.

Cheers

[dromia]

It is no doubt reliable within its limitations.

A customer was working up loads for a new rifle. He had some published data but was also using Quickload. He came to me with a Quickload print out of a load he was using, within the powder manufacturers limits but towards the top end, he said he got a stiff bolt with the first round he stopped shooting after that. The Quickload print out he had showed the pressure curve to be well below the maximum so he was wondering why the stiff bolt. I took a pencil and re-drew the curve putting it up about the maximum, that is what he needed to conclude it was the Quickload prediction that was out, but by using the programme he was blinded to the obvious, that round was overpressure for that rifle.

If you get a sticky bolt then it is too late you have fired an overpressure round, it should never get to that.

Your target, a chronograph and rifle will tell you all you need to know about your handloads.

I actually used the ballistic element of Quickload far more than the load data part. I found it mildly entertaining.

[xcudlaty]

Really speaking, any data is only guidance. Sitting depth, barrel, case capacity, primer, will affect pressure and velocity. That is why I always prefer start with smallest advised amount and go gradually up. Anyway I' m shooting only up to 600 yards as got no access to longer range and bit short with time to go to Bisley. So not trying push loads to limit and prefer not to use high energy powder like RS52. In my opinion there is no point to burn barrel quicker if there is no need for it.

For my Tikka, RS50 44gr with 168gr Sierra MK BTHP and standard CIP length fly very well. Now I'm going to play with AOL
Thank You for advices