lee pro disk powder measure


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lr45lc
September 6, 2011, 01:56 PM
Hi All,
I have the lee pro disk measure and it seems not to matter what powder I use it is one grain short of what the chart says it should be. Has anyone else had this problem? I have balance beam scale and an electroinc one. I use the disks that came with it. Thank you.

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chhodge69
September 6, 2011, 02:18 PM
I had that problem with the one powder I use - I assumed that Lee included a safety factor on their chart.

bds
September 6, 2011, 02:23 PM
it seems not to matter what powder I use it is one grain short
One grain is a lot. Did you mean 1/10 of a grain?

When you initially pour the powder into the hopper, it will "fluff" the powder. I usually cycle my Pro Auto Disk several times (dump the powder back in the hopper) to settle the powder before I start weighing the powder charges. Some people tap on the hopper to settle the powder also. I then weigh the powder charges until they are consistent.

For me, depending on the powder used, actual charges have weighed about .1-.2 gr lighter than the chart. W231/HP-38 is just about the only powder that has come close to the chart on all the charge weights consistently, but depending on the lot number, still weighs a bit on the lighter side. There are some powder/charge drops that weigh accurate to the chart, but I use the chart as a "guide" only and rely on the actual weights indicated on the scale.

lr45lc
September 6, 2011, 02:45 PM
thanks for the replys. I always cycle the powder 4 or 5 times before I start weighing it. I wanted to have 14.7 gns of 2400 that would be the 1.09 disk it would out at 13.4 to 13.5 after at least ten times. maybe they just have a saftey factor built in.

Hondo 60
September 6, 2011, 03:50 PM
I think the OP is referring to the fact that those discs do NOT measure correctly.
Please be safe & use a scale.

Then next time just remember what hole you used (or mark it).

JDGray
September 6, 2011, 05:38 PM
Once all the static is removed from your system, it should throw pretty close, if not a few tenths light. Power Pistol, Clays, throw spot on for me.

Sin City Shootist
September 6, 2011, 05:38 PM
As Hondo said, use a scale, those charts are off by a mile.

hvychev77
September 6, 2011, 06:16 PM
best thing to do is to keep changing the discs until it throws the charge you need, and then measure often until you build up some trust in it. i have been using the lee disc set up to load for 9mm. and it's been great for me. i have been using W231 with various weights of bullets and it's been spot on so far. once i've gotten the static out of it, it'll throw weights that don't vary more than +/- .10 of a grain.......keep us posted, and again, check your weights often!!!

GP100man
September 6, 2011, 07:24 PM
best thing to do is to keep changing the discs until it throws the charge you need, and then measure often until you build up some trust in it. i have been using the lee disc set up to load for 9mm. and it's been great for me. i have been using W231 with various weights of bullets and it's been spot on so far. once i've gotten the static out of it, it'll throw weights that don't vary more than +/- .10 of a grain.......keep us posted, and again, check your weights often!!!

What hvychev77 ^^^^ said !!

I threw my chart away & keep a log of which disc throws what & even after all this time I weigh every tenth charge !

oldreloader
September 6, 2011, 11:20 PM
Mine usually runs from 0.2 to 0.4 grains lighter than the charts depending on the powder. It IS very consistent in the charges it throws.

ArchAngelCD
September 7, 2011, 03:43 AM
The charts are wrong, not the powder measure. The chart is meant as a starting point, it's not perfect. Go up to the next disk and see what you get.

dickttx
September 7, 2011, 10:10 AM
Everyone has pretty much said it. The instructions say the chart is a starting point and will always throw a lighter load. It is not uncommon to have to move up two sizes.
Once you have established the hole size needed to throw your preferred load it is very consistent.

squarles67
September 7, 2011, 11:46 AM
I've found the Lee charts to be close on some powders and way low on others. They are a just starting point and should be verified with your scale.

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