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You are correct that powder selection and weighing accuracy can certainly come into play with SD/ES, but unlike a powders temperature stability which tends to be independent of the cartridge/rifle, SD/ES is influenced by a multitude of variables controlled by the individual as well as the barrel/chambering characteristics. Another shooter with a load similar to yours may very well achieve a better or equivalent SD/ES with a different powder with his barrel and methods. I have personally been able to achieve low SD's(<5) with Varget, H4350, and R-16(amongst other powders)by optimizing my parameters. I would agree that some powders achieve SD more easily then others, but IMO it would be difficult to build a reference chart. Chemical properties like temperature stability and burn rate, on the other hand, are measurable determinants of the powder alone, enabling the use of fairly reliable reference charts.
so you are saying that powder/burn rate has absolutely nothing to do with sd and es?--I don't totally agree with that
I know that "exact" powder charge, neck tension, annealing, etc all play a major roll in sd and es spread --but I gotta believe that the powder itself also plays a roll in it too.
I have seen lower ES and SD in my 30-06 with RE16 than any of the other powders I have tried in that cartridge/rifle-- my reloading technique/process and brass did not change at all regardless of what powder I used (same bullet for all powders tested) ---that leads me to believe that some powders will have a smaller spread than others due to the powder itself
I was trying to see if anyone had actual recorded data on a test like this to see what others have come up with
You are correct that powder selection and weighing accuracy can certainly come into play with SD/ES, but unlike a powders temperature stability which tends to be independent of the cartridge/rifle, SD/ES is influenced by a multitude of variables controlled by the individual as well as the barrel/chambering characteristics. Another shooter with a load similar to yours may very well achieve a better or equivalent SD/ES with a different powder with his barrel and methods. I have personally been able to achieve low SD's(<5) with Varget, H4350, and R-16(amongst other powders)by optimizing my parameters. I would agree that some powders achieve SD more easily then others, but IMO it would be difficult to build a reference chart. Chemical properties like temperature stability and burn rate, on the other hand, are measurable determinants of the powder alone, enabling the use of fairly reliable reference charts.