Lee Pro auto Disk question

[Dand]

I use the Lee Pro auto Disk on my Lyman Turret for loading handgun cartridges - 38 357 9mm 41.  I mostly use Unique, H110, 269, 2400, some Herco, Bulls Eye, Blue Dot   and Green Dot.

With the hopper full I usually have to go to a larger hole in the disk than the Lee table indicates, to get the grain wt of powder I need - especially with the  flake powders like Unique and Blue Dot. Some times I have to go up two holes larger than indicated to get the right weight.
 
Anybody else have this experience?  
Is the chart in the first Lee reloading book off or ?

 I always settle the powder and throw and discard the first 4-6 throws or more, check the first 5 weights with the scales and do seating die adjustments before going into full production.  I recheck powder weight thrown every 15-25 rounds just to be safe.

Suggestions?  I really noticed this the other day while loading 400 rounds of 357 200 with Unique and 200 with Blue Dot.  And I use check weights with my scale.

[New Hampshire]

The reason is the coarsness of the flake.  There is a small warning in the pamphlet that warns of this.  Ive found, as they suggest, that tapping a couple of times with a dowl or screw driver to help fill the cavity helps a bit.
Brian M.

[Castaway]

I've noticed the same thing.  I use the listed disc for a  place to start, throw 10 charges, weigh all 10 and adjust discs until I get what I want.

[Black Jaque Janaviac]

Yes, my experience has always been that the Lee tables are "light". I use the adjustable measure instead of the disks.  This makes correcting for the deviation from the table much easier.  Then I write down what the adjustable measure volume is and go back to that setting if I find that load suitable.  I've even found the Lee tables to be light for ball powders too.

I don't know if flake powders just aren't that good in the Lee Auto disk measure or not.  I haven't tried that many different powders, but the two ball powders I've tried are way more accurate than the flake powders.

[jgalar]

Lee has their powder charts set up to drop the charge with the powder manufacturers weight tolerance level built in. Powder manufacturers have  a range of what a volume of a given powder will weigh. Some of the powders I have used were darn close to what Lee states in their charts and some dropped approx 6% less. Lee states this is normal and to contact them if you ever find a powder combination that drops more than what the charts state.

[Dand]

I appreciate all the comments.  Its been a long time since I read all the instructions - I'll look again.  It also shows it helps to always check the charges as thrown and not depend on any cheat sheet.  I had begun to wonder if our lack of humidity in winter had dried out the powder or something.  

Thanks again for the comments.