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Discussion Starter · #1 ·
I set up my Lee Auto Disk Powder Measure this morning. It really throws consistant loads, but the chart they use seems to be way off. According to the chart, for 3.9 grains of Unique, you should used the .43 disc....well, .43 disk was throwing 3.4 grains according to my elect. scale and the balance beam. I had to go to the .49 disk to get 4.0 grain (which is what I wanted anyway). I loaded up 12 rounds, and will take them to the range one day this week, to see how they shoot. I measured each charge to ensure it was throwing consistantly. If the rounds shoot as good as my test rounds did (and there is no reason why they shouldn't), the it will sure save a lot of time.....
 

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I'm goingto invest in a powder throw too. With that and the new scale I'll be moving right along. :)
 

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this is from the lee precision site

The powder manufacturers allow themselves a 16% tolerance in the density of their powder, from lot to lot. We have to calibrate our chart to show the high side of that tolerance, so you should never get more than what the chart indicates, but you will sometimes get less. Believe the scale. If your measure consistently throws less than what the chart indicates, try going up to the next larger cavity. If the powder measure throws more than what the chart indicates, please let us know!
http://www.leeprecision.com/cgi/faq/index.cgi

so with my old way of doin' math,
3.9 divided by 100 = .039 which should be one percent
.039 X 16 = .624 which is 16%
3.9 - .624 = 3.276
so by these figures, if the cavity still throwed 3.2 grains, it would still be within lee's tolerances, as it is, 3.4 i guess ain't too bad.............if the powder makers were more consistant in their production and everything was guarantee'd to stay the same year after year in powder volume/weight, there would be no problem but apparetly there has been as lee has found a 16% disparity over a broad selection of powders-----some types te variances may be small while others it could be as much a 16%, therefore the safety factor built in.............

as well as this:

Make sure that when measuring charges thrown by the Auto Disk measure, that it is done out of the normal loading sequence. It is important that the measure work consistently in the amount of force used to move the disk to the drop hole and return. This is accomplished through consistent press lever operation every time.

You may want to "condition" the measure by either using powdered graphite on the disks or running the equivalent of a pound of powder through the measure. If you find that inconsistencies still exist, you may want to wash the disks in warm soapy water, rinse and let air dry. This should help eliminate any static that may have been present.

Lastly some powders do not meter well, Unique powder is one example that meters with "casual uniformity". You may find the same symptom with small flake powder in small quantities.
http://www.leeprecision.com/cgi/faq/index.cgi

the lee folks are just bein' cautious and also don't get too use to things as always the same---the charge weight can change from powder lot to powder lot or as i like to say, jug to jug of the same stuff made at different times of the year..........
 

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Yep, the chart is just a guide. Always check the weight with a good scale. I have almost always had to go to a bigger cavity to get the charge weight I need.
 

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Discussion Starter · #5 ·
The quotes you sited, Deputy are in the instructions. I didn't see the part about Unique not measuring good. I will be sure to check at least every 2 or 3 rounds. If it doesn't work out good, I'll just go back to the old thrower I've been using....I know it's accurate.
 

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that disc measure can be purty consistant on the throw. but it helps to get into a rythem and operating the same way/speed everytime you work the handle with the same smooth stroke each time.............
 

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I added thethe that you dail in the weight ya want, sorry throw the bow away and I forgot what they call it. The reason I threw thew the box away ks that its in constant use lol. Ok found it its the adjustable charge bar the lee site says $9.98 well worth it.
 

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VMD for Lee auto disc powder measure/Benchmark powder

Hello fellow shooting enthusiasts. I am looking for information on the VMD (volume measuring density conversion number) for Benchmark & CFE 223 powders with the Lee Pro Auto-Disc Powder measure set. I am loading .223/5.56 and am looking for the conversion to use the double disc set with my Lee Progressive loader. Any loads for BenchMark, IMR 4198, IMR 4895 or CFE 223 powders would also be helpful.

Thanks in advance,
 

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Hello fellow shooting enthusiasts. I am looking for information on the VMD (volume measuring density conversion number) for Benchmark & CFE 223 powders with the Lee Pro Auto-Disc Powder measure set. I am loading .223/5.56 and am looking for the conversion to use the double disc set with my Lee Progressive loader. Any loads for BenchMark, IMR 4198, IMR 4895 or CFE 223 powders would also be helpful. Thanks in advance,
Glad to have you TBV. Welcome.

Here is a VMD chart from Lee in pdf format. Hope that helps. Someone else, who actually knows what they're talking about, will most likely be around later.
http://www.leeprecision.com/cgi-data/instruct/VMD'S.pdf

Here are some free E-book downloads on the subject if your interested.
benchmark VMD... http://www.gobookee.net/benchmark-vmd/
cfe.223 VMD... http://www.gobookee.net/search.php?q=cfe+.223+vmd
 

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I'm not familiar with that powder and will check my books the next chance I get. Or someone else that is may step forward. And welcome to our small corner of the world.
 
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