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Anyone who uses a common powder dispenser (such as the RCBS UniFlow) actually DOES measure by volume, not weight.
True, the person may adjust the volume to achieve a weight -or close to it- but the actual dispensing is by volume.
Only if you weigh each and every charge do you truly load a weight of powder.
Electronic dispensing systems (such as the PACT/RCBS) are pure weight systems, because the scale controls the dispenser.
Benchrest guys use very accurate and very expensive powder dispensers such as a Harrell's or a Redding BR. Normal shooters don't need that kind of accuracy or expense, because a variation of a few tenths of a percent of the charge weight is meaningless.
RCBS, Lyman, Hornady, Redding and others all make good dispensers. A semi-new one is the JDS I reviewed on my webpage, but it's for rifle only. It's very good, though.
User technique is more important than the brand you choose. With good technique, even the Lee dipper set is perfectly adequate for most loading. I use one myself at times, especially for pistol loads.
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