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Powder manufacturers mix and blend various lots of powder and may even coat the grains or use other processes to achieve a particular pressure level standard with any specific canister grade powder.
Each lot of a specific powder is created to provide the same performance, within industry tolerances, as the previous lot or a lot that was processed 10years ago. This adherence to a standard for a specific powder is the reason that yesteryears loading data is still valid and safe to use with that powder.
Mixing the dregs of several cans of a specific powder will not materially show different performance from the performance obtained from any of the cans individually.
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