Quickload and/or GRT

[C_Ackley]

Mentioned in post #13 under first steps..

Bears repitition.

 

[J_idaho]

How is GRT accurate to predict nodes? Does it tell you where the “nodes” are somehow??

so nearly everything on the page can be changed. after you pick your chamber you pick your bullet then powder. once you impute all your info you go to the OBT button and it will show you your info based on your velocity's that you put in. this will change the powder burn rate to match your velocitys. then you can create a new file based on those perimeters.

 

[J_idaho]

 

[J_idaho]

On a side note I’ve always wanted a thread showing shooter data to input into grt to test and compare the nodes folks chose to shoot. So feel free to dump all your input in and I’d be happy to run in grt.

 

[Dave M.]

On a side note I’ve always wanted a thread showing shooter data to input into grt to test and compare the nodes folks chose to shoot. So feel free to dump all your input in and I’d be happy to run in grt.

I’d love to see a great classic example of someone developing a load using GRT or QL.

 

[J_idaho]

Case capacity h2o weight in grains
Case length
COAL
How far off lands
Neck tension
Barrel length
Some velocity readings for burn rate of powder for that lot
Bullet/ if custom you need all info possible
Powder
temperatures
You could try without shooting but it wouldn’t be right. Ballpark at best

 

[Straightshooter1]

I’d love to see a great classic example of someone developing a load using GRT or QL.

This is an approach I've used:

First, if I'm looking for a powder with a certain burn rate characteristics, I go to QL and input screen for Propellant Table Setup to see what powders might interest me (like when I can't get the powder I really want):


It'll provide a list like this:



Then select a powder to use and will need to fire a few rounds to collect velocity data in order to tune the (Ba) burn rate in the app. Other data needed per what J_idaho listed for input to get good calculations:


Then a list of various charge weights can be produced where one can see things like estimated Pmax pressure, case fills, velocities, barrel time. . . things that help decide where might be the best place to start load development:


QL doesn't do all the load development work for you, but it does save on time and reduces the amount of components used to get to a good load.

 

[Dave M.]

This is an approach I've used:

First, if I'm looking for a powder with a certain burn rate characteristics, I go to QL and input screen for Propellant Table Setup to see what powders might interest me (like when I can't get the powder I really want):
View attachment 1531140

It'll provide a list like this:

View attachment 1531141

Then select a powder to use and will need to fire a few rounds to collect velocity data in order to tune the (Ba) burn rate in the app. Other data needed per what J_idaho listed for input to get good calculations:
View attachment 1531142

Then a list of various charge weights can be produced where one can see things like estimated Pmax pressure, case fills, velocities, barrel time. . . things that help decide where might be the best place to start load development:
View attachment 1531149

QL doesn't do all the load development work for you, but it does save on time and reduces the amount of components used to get to a good load.

What does the “*T” and/or “*C” mean next to the powder name?
Dave

 

[Someone online]

What does the “*T” and/or “*C” mean next to the powder name?
Dave

*T is temperature insensitivity
*C is copper fouling removing additive,
Those are my understandings of it anyways

 

[jepp2]

I used QL for over 10 years on every round I fired. More recently I converted to GRT as I see it as a more powerful tool. You asked about load development. I shoot a 20 Practical and there is very little load data available for 39/40 gr bullets. So I took the powders I had experience with, and using that experience ran calculations in QL for each of them. My goal was a 50K psi load (safe) and shot them over a chronograph. The 2'nd column shows the predicted velocity for each powder from QL, and the last column show the velocity I measured. Just gives you an idea of the ability to predict pressure using velocity from a computer model.

To explain my example, take the first powder listed. IMR 4198, using my previous load experience I knew the adjusted powder burn rate (Ba) was 0.9070. For my goal 50K psi load, using 20.9 grs of powder should yield a velocity of 3498 fps. My measured fps was 3501. Not all turned out this close, but they all were safe starting loads I could share with others.

 

[RegionRat]

Well done @jepp2

 

[Fclassfool]

I'd like to see a program like these that can be run on android and a chromebook at least