Be alot more easier to just buy an RCBS Charge Master and probably cheaper too.

Ron, I have an elderly AMT powder measure that uses two "tricklers", one is high-speed and it shuts off when the beam on the scale below it approaches the set amount, where the slow trickler finishes the load by reading the beam's position. It is quite accurate, and cannot cut the coarsest powder stick, but very slow to load many cases with this thing. I found it very useful when you want to load a few cases with each setting, and then move up or down by a little like we do when load development is the intent. You don't need to adjust both a measure and a scale. But, it was a pain waiting for each load to hit the pan. The German one shown here doesn't look like anything but attention to the beam would keep it from being a lot more variable, since the shaker (?) might dribble extra just as it decides to halt. You know what I mean- I hope. Anyhow, I don't use that old thing much anymore, and I would be scared s----less using that thing with the electric switch sparking right next to my powder pan! Good luck to you if you build it.  Pat

Here is a powder measure that David Tubbs , a highpower champion used.

A Scale is a Scale--Or Is It? By Brand Cole, Prometheus Tool Corp.

I was approached by the folks at 6mmBR.com to provide a Prometheus scale for testing. I did not at this time have a demo unit to send out, and was curious about the testing protocol being envisioned. That conversation led to this article. It will be kept basic, with concepts presented but not mathematically proven. For that you may consult a statistics text.

Manufacturing uses statistics to predict the dimensions (measurements) of a population (all units produced) based on measuring a sample (the few parts you actually measure). In this instance we are "manufacturing" weighed powder charges, and want to know how "accurate" the population of the charges will be by measuring a small sample. These charges will typically follow what is called a "normal distribution". This is the same thing as the old "bell curve" that was used in school to grade on the curve. You may have heard the term "standard of deviation" (SD). Most any scientific calculator today will calculate the SD once you input the raw data points. If you take the mean (average, or (X)) of your sample, and add to that plus and minus three (3) times the SD you will capture or describe 99.7% of the entire population. This technique is known as "Six Sigma" since the Greek letter sigma is used as a symbol for SD. Six-Sigma is a fairly standard technique in many manufacturing firms. There are some parameters that must be followed here, including sample size. This is a topic in and of itself, but the bigger the sample, the more accurate your results will predict the population. In most SPC work in manufacturing, between 5 and 10 pieces are typically sampled to look for trends in the dimension. There is more here.

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Powder charges I throw at the range are just as accurate as home thrown charges. With the added advantage, being able to change charges and components as conditions might require. Fixed ammo made at home is a huge dis advantage at a bench rest match. Standing, not so much. 

Hunter? Fixed ammo of course. Jacketed bullets a big advantage here in the West. 

I have a RCBS powder measure like the one pictured above. Most inaccurate measure I own. Terrible. Good enough to dump powder on a scale. 

          Joe.

Wind at the range a problem that affects powder measuring?

It's one heck of a lot less problem verifying charges if you use a digital scale to verify.    And wind really doesn't affect the way measures work as the wind can't begin to get inside any measure a sensible person chooses to use outside.

How you process the powder also solves problems.    Set the case on the digital that's sitting under the measure.  Tare the scale.   Raise the case to the measure and drop the charge.  Set it back down on the digital and read it.    

Would you need to test in high wind?  For what?  Accuracy?   

Testing loads at the range are fun to do.  And if you're sensible, you can easily get solid data sensibly.

Might have a problem with a Belding and Mull measure in heavy wind. 

Did you mean powder scales, Jeff?

No need to weigh powder charges at home or at the range. Unless of course using coarse grained powders or when using my RCBS powder measure, for anything 

       Joe. 

A Harrel Measure and a suitable ball powder and your problems are solved. A note book of settings is all you need either at home or at the range and the only use for a scale would be to obtain the settings for range you wish to work in.

Did you mean powder scales, Jeff?

Yes I did. Sorry