Pro Auto Disk problem - THR

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Old Yesterday, 09:37 PM   #1
Join Date: July 6, 2013
Location: Hilton Head, SC
Posts: 103
Pro Auto Disk problem

This one really has me stumped. I've been loading 4.2gr of Bullseye in my 9mm rounds using a Lee Classic Turret press and the Pro Auto Disk powder measure. The .49 disk consistently drops 4.2gr, once in a while dropping 4.3gr, but not often. So far I've probably loaded 1200 rounds without a problem. All of a sudden tonight in the middle of a reloading session, it started dropping 3.9-4.0gr and then after about fifteen of those, it started dropping 3.6gr consistently, not 3.7 or 3.8, but 3.6 every single time. I took everything apart and cleaned it, then tried the .53 disk. It was also consistently dropping loads about 1.3gr lighter than usual. Everything appears to line up correctly so right now, I'm at a standstill. If anyone can shed some light on this, I would greatly appreciate it. Thanks.
tcoz is offline  
Old Yesterday, 09:52 PM   #2
Join Date: January 10, 2010
Posts: 8,523
Check the tension on the bead chain and be sure the spring at the end is compressing when the shellplate carririer returns to the bottom. Any slack in the chain may prevent full return of disk under the powder hopper wiper that will produce lighter/inconsistent powder fill.
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Old Yesterday, 10:02 PM   #3
Join Date: September 24, 2010
Location: New Hampshire
Posts: 325
Also check that the cavity in the disk lines up with the drop hole when the handle is fully depressed. You might have meant that that isn't the problem when you said "everything appears to line up correctly" but maybe not, and this is an easy thing to check and fix. A short down stroke can cause the cavity to only partly line up with drop hole resulting in a partial drop of powder.

This is more likely to happen if you've been switching between cases of different lengths recently or altering your technique (i.e. if you've switched how you are sitting so you're now bumping into your leg on the down stroke).

Good Luck,

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Old Yesterday, 10:46 PM   #4
Join Date: July 6, 2013
Location: Hilton Head, SC
Posts: 103
The disk appears to line up properly but I'll check in the morning when the lighting is better. You mentioned that it's an easy thing to fix. How is that done?
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Old Yesterday, 11:09 PM   #5
Join Date: January 12, 2013
Location: buffalo
Posts: 80
I would take the hopper off, inspect and clean it. (wipe it down with a drier sheet.) Tear everything apart, check and clean. You may have an obstruction or static giving a problem. Once in a while you run into something like this and you just need to stop and check everything. You will find the problem. The auto disc is a pretty good system.
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Old Yesterday, 11:32 PM   #6
Join Date: December 16, 2013
Location: NW Ohio
Posts: 167
Could the warmth and humidity play a role in this?
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Old Today, 12:38 AM   #7
Join Date: May 26, 2013
Posts: 492
Take off the powder can and watch it function back and forth. The further the die part is screwed into the base of the turret, the farther forward the disc slides, the further out it is screwed in, the less forward it comes. Make sure the brass knobs are snug once you put it back together.

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Last edited by RussellC; Today at 12:50 AM.
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