Factory Ammo Powder Weight consistency?

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BBDartCA

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Has anybody ever looked into the variability in charge weight for a given box of factory ammo? Would be curious to know what kind of % weight variance typically seen over 20 to 100 rounds.
 
I actually did this last weekend. I am pulling a large lot of steel case factory ammo for a friend, and when I started, for the first 20 rounds I weighed the powder to see what it was. Surprisingly enough, the powder weight was pretty much bang-on for every round - no variance to speak of. This particular lot was 45 Auto and weighed on an RCBS 505..

You didn't specify caliber or manufacturer, so YMMV.
 
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