From HSMITH: "Uncle Don, a lot more plays into it than a simple cavity. Baffle design or lack of a baffle, closeness of tolerances, rigidity of the mechanism, repeatability of the mechanism and so on. The better the measure the less setup and operation alter the dispensed amount.
I have had at least one of all the popular powder measures on the market looking for one that 'does it all well' and I finally found it in a Redding 3BR. The Lee measures leave a lot to be desired with the exception of the 'Perfect Powder Measure' and short cut stick powder where it really works nicely.
The Dillon measures work beautifully with Unique right out of the box without any special setup, operation or treatment, as does the Redding 3BR."
I have a Redding 3BR. My Hornady LNL measure that came with my Hornady LnL progressive is significantly more consistent with every single powder I use. (W231, W296, 4895, H110, Titegroup and others that I can't think of right now.) That said, the 3BR is a decent powder measure, but it is not the wonder wookie you're extolling it to be. It's not any better or worse than any of the rest.
Each measure works better or worse with some powder than some of the others. Extolling the virtues of various powder measures the fellow who started the thread doesn't own isn't helping him. It's kinda like extolling the virtues of a Porsche 911 while you're standing beside a guy who's working on his broke down on the side of the road Camaro or Mustang. "That's nice, but who really gives a rat's rear?" You ain't helping, you're just sounding off.
paccw,
I don't own a auto disk, but I plan on buying a couple to use on a Lee classic turret I plan on buying, so I've been reading quite a bit on them. Here's a couple potentially helpful suggestions:
1. Try cleaning up any flashing on the plastic moldings.
2. Make sure the assembly fits together as good as possible and polish up all working parts.
3. "Lubricate" the measure with some powdered graphite.
4. Try the next factory "load setting" for the measure and see what results you get. If they're what you're looking for great. If not, let's go on to step 5. Buy a Micro disk and add that to the mix and see how it works.
6. Buy a double disk kit and see how that works with it.
7. Buy a adjustable charge bar or an aftermarket charge bar and see how they work with the measure.
8. Get a fellow who's very experienced with Lee products to come to your place and help you or give Lee Tech Support a call and see what they suggest. They've probably ran into the problem before.
9. Finally, if you can't get that particular powder to meter as you wish in that measure, try another suitable powder.
10. If you can't get another powder to work, perhaps then it's time to try another measure. But I don't think you'll make it to this step before you resolve your issues if you're patient and persistent in working on the problem.
Hope this helps,
Dave