Rick W:
The manufacturers make a great effort to keep their commercial powders within published specifications on a continuous basis, year to year. Doing otherwise would be commercial suicide for them. Without this consistency, why bother publishing loading data for their products at all?
As to firearm to firearm variables, a little knowledge and common sense is required, and good judgement is to be exercised. I have assembled seemingly perfectly good lower-end loads that have pierced primers before in High Powered rifles, letting gas escape through the action. Try a face full of that once or twice and you will have a new appreciation for conservative, consistent, reloading procedures.
In the end, however, to each his or her own.
Sieger
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