Both the bullet and the powder is weighed in grains. When you buy a commercial load they are referring to the weight of the bullet, not the weight of the powder or the weight of the case. The weight in grains of the powder on a commercial bought bullet is irrelivant to the shooter because you do not know what powder they used. On the other hand those who want to reload their own to optimize their bullets both the weight of the bullet in grains and the weight of the specific powder in grains is very important.
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