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The only way I really know you could duplicate a factory load would be the Hornaday factory loads that have the recipe on the back of the box. I can look at powder and make an educated guess as to what it is, but I can not tell you with any degree of certainty what a powder is by looking at it. Many of the powders the factories use are not even available to reloaders. I remember reading many years ago that Winchester goofed up a huge lot of powder they could not sell to the reloading market so they factory loaded with it.
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