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I'd guess that it might be a coincidence that the best loads are still burning. This might be because most loads that are still burning are lower performers and your rifle might be partial to slightly slower loads. In my experience the best loads for a given rifle seem to be loads of a given velocity, regardless of the components that achieved that velocity.
If you really want to know about the burning, I'd suggest a program called QuickLoad ... it isn't free, but it can be VERY insightful. It is an interior ballistics model.
Saands
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