What gives?????

[GRMPS]

I've downloaded 2 powder crass reference charts and 3 powder Burn rate charts and none of them agreed with each other

 

[462]

Yep, and they don't agree with any of the old charts, and any future charts will not agree with neither any of the old nor any of the current charts.

'Tis no different than any two of many dozens of reloading manuals agreeing on any powder's load weight, chamber pressure, or bullet velocity.

 

[PGPKY2014]

they are not set in stone ,for a general guide only

 

[fiver]

i think some lazyness [and ignorance] is involved when most of those charts are made.

 

[Jeff H]

I always pick the one which aligns most closely with what I want to believe.

 

[Rick]

They all used different equipment, testing criteria and everything else from temperature differences to who knows what. Burn rate charts are a guide, not a loading manual.

 

[RicinYakima]

If you rely on those, you will have an explosive surprise one day.

 

[Spindrift]

My favourite burn chart for rifle powders, is the Norma chart. The things that makes it stand out from other charts:

1) They state the conditions under which the powders are tested, and
2) These test conditions are exactly the same for all powders listed, and
3) Information on both relative burn velocity and pressure is provided.

It is not complete, however. But maybe you can find some useful information there?

Reloading Data | Data for handloading with every caliber

NORMA wants to contribute to development and therefor we share approved reloading data for handloading with every caliber. Learn more about hand loading here!

www.norma-ammunition.com

 

[GRMPS]

A big thanks to all who responded. I kind of surmised this but it's good to have my suspicions repeated by others.
My goal has always been to find the lightest most accurate load. I short for fun and don't enjoy beating my shoulder/wrist to death [pluss less powder per load means I can load more bullets
Thanks for the link Spindrift, I will add it to my "book" of burn rate charts.