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"On the other hand, powders do vary a bit from lot to lot of the same name powder. "
The canister grqades are held tighter then 'non-canister' grade powders.
Commercial (and mil) ammunition is almost always loaded woth non-canister grade to save money.
Sometimes you can even purchase bulk powder that is either non-canister or a batch that failed the canister grade tests.
Accurate Data Powders, and various lots of Winchester are available this way sometimes.
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