Thread: QuickLOAD just arrived!

https://pierrevanderwalt.com/obt-calculator/

This will help.

It's a major league brain ache, the Optimum Barrel Time theory, but worth working through even its its just the summary.

Pick a node value on the ladder from this calculator, then play with Quickload until the Barrel Time, 10% pMax to Muzzle value matches your node.

Load according to those specs, shoot, and woo hoo the theory says its all done and dusted.

Worked for my mate and he's a techy nerd. Worked for @Robojaz.

I'm gonna load some up this evening and go for a test as soon as this weather blows through.

Thanks, I've read some of the OBT papers today and was just at the point of asking, 'well what do I do with it'. You just just sorted me out. Same back to you real soon @Flyblown.

@Gerardo (someone got the disc!)

Where is best place to get quickload program, order from UK or I seen some Aussie gunshops have it?

Originally Posted by jackson21

Where is best place to get quickload program, order from UK or I seen some Aussie gunshops have it?

I ordered from uk, took a couple weeks to arrive.

Mr. Longs optimum barrel time can be disproved by finding observations that disagree with the predictions of the theory. Accepting that it doesn’t works in some cases, it would have been nice if it was still useful as an aid in predicting accuracy nodes, but I have not found this to be the case. From the time the theory was first presented I have gone to some lengths to apply its predictions to my rifles & loads – including corresponding with the author to get clarification on the effects of barrel discontinuities, chamber length and the effect of this on the point of origin of the so-called shock wave - but when all was said and done I’ve never had any success in using it as a help in finding loads that shoot smaller groups. From the outset it seemed to me that if this approach was able to predict barrel behaviour, then it would be better applied in finding the barrel times to avoid than the opposite, but I haven’t found this to be true either.

QuickLOAD on the other hand is a wonderful thing that just has understandable modelling limitations.

Originally Posted by Puffin

Mr. Longs optimum barrel time can be disproved by finding observations that disagree with the predictions of the theory. Accepting that it doesn’t works in some cases, it would have been nice if it was still useful as an aid in predicting accuracy nodes, but I have not found this to be the case. From the time the theory was first presented I have gone to some lengths to apply its predictions to my rifles & loads – including corresponding with the author to get clarification on the effects of barrel discontinuities, chamber length and the effect of this on the point of origin of the so-called shock wave - but when all was said and done I’ve never had any success in using it as a help in finding loads that shoot smaller groups. From the outset it seemed to me that if this approach was able to predict barrel behaviour, then it would be better applied in finding the barrel times to avoid than the opposite, but I haven’t found this to be true either.

QuickLOAD on the other hand is a wonderful thing that just has understandable modelling limitations.

I found the same, over a reasonable sized sample I couldnt find anything usefull..
and I would put "modelling limitations" in bold print.