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Dillon PM Drift - problem solved!

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Post by RoyDean 10/9/2022, 4:17 pm

First topic message reminder :

OK, everyone now has my permission to call me a dumb-ass, or whatever!

Some time ago a High Master Reloader I know advised me to stop using my trusty 50 year old Lyman Beam Balance and switch to a good electronic scale - good advice! I bought a Gem Pro 250 and it is excellent.

Recently I have been struggling to solve a "drift" problem with my Dillon 650 Powder Measures. I've tried all of the recommended tricks, checked and tripled checked, polished this and that, swapped out the Arredondo Micrometer bar with a HMR supplied bar with a set screw to "lock in" the setting. All to no avail. I kept seeing 0.05 to 0.1 grain "drift" during the course of a session of about 400 rounds.

Today it dawned on me. It is not the PM drifting, it is the scale!

I had got into the habit of taking one shell and setting the scale to zero with that empty brass. Each time I want to check the drop I would put that "zeroed" piece of brass into station 2, pull the lever, take it from station 3 and measure the weight. Today I did that as usual, but something triggered me to check the zero again each time before I put my "zero" brass back in - the scale had "drifted" by 0.05 grains in just a few minutes. I zeroed the brass again, dropped, weighed, spot on. I repeated that about eight times through the course of loading about 400 rounds, every time the drop was spot on!

Aaaarrrggghhhh!!!!

RoyDean

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Post by Jack H 10/11/2022, 11:24 pm

Powder position in the case might have more to do with variance than a tenth or two.
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Post by RoyDean 10/11/2022, 11:30 pm

Jon,

You have never in the past sought permission before making fun, why start now?

It is interesting how this thread has twisted and turned quite unpredictably! I guess that is the true beauty of this wonderful forum.

RoyDean

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Post by RoyDean 10/11/2022, 11:42 pm

Wobbley, and others. I do get it that, in the 45 at least, minor variations in powder drop are most likely not significant in the overall scheme of things.

But, I've spent a lot of money on high quality equipment and I expect powder drops to be rather consistent. It remains to be seen whether the repeatability of my current set-up continues.

Another lesson learned!

RoyDean

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Post by TonyH 10/12/2022, 7:14 am

john bickar wrote:
RoyDean wrote:OK, everyone now has my permission to call me a dumb-ass, or whatever!

Is this offer still on the table?
lol!┬áHe may be rethinking that….
+1 on the A/C coming on and the draft causing the digital scale to fluctuate. I can tell nary an applied difference in my score averages shooting CF/45 when loads vary by a couple of tenths. Easy to get lost in the minutae and forget about the true task at hand. My two cents.
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