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Evan, trickling powder to "exact" weight can't hurt. But it doesn't help much, either.
Denton and I discussed this the other day while we were at the range. He's working on an article i which he's testing powder dispensers for accuracy, and I've had an article in mind about the need (or not) of precise charge measuring.
What we agreed on is that something like a 1% variation in powder charge weight is meaningless. With a 50-grain charge, that means a half-grain variation from charge to charge has NO appreciable (or statistically meaningful) effect on either velocity or pressure.
There are so many other things that have an effect that powder charge weight just gets buried in the sum of the other causes.
The bottom line is that any dispenser that keeps powder weights with a few tenths of a grain is perfectly fine.
Weighing down to "dead nuts on" is okay. It can't hurt. Don't stop if you want to do it.
But it doesn't help, either.
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