Make sure you are using the spring at the bottom of the bead chain and fully cycling the ram handle to ensure the disk is returning fully for full fill of the hole -
https://leeprecision.com/5-8-free-ht-spring.html
If you don't do these consistently, you will get inconsistent charges with Titegroup.
That spring applies to progressive loaders. I am using the Lee Pro Disc on a Lee Classic turret press so it depends on a much larger spring mounted on the powder measure to return the disc into position under the hopper (the non-progressive lever arm+spring). It depends on the flaring die and operates based on the entire assembly being pushed up as the case is rammed into the die.
I think my problem was related to static electricity and the small charge opening.
If you are doing both of these yet still getting inconsistent charges, inspect the bottom of wiper for damage and replace as necessary (And be sure to lubricate the surface of wiper with fine graphite powder or finely shaved No. 2 pencil lead rubbed on paper) -
https://leeprecision.com/wiper.html
https://leeprecision.com/wiper.html
I could probably use a new wiper. Thanks for the link.
When I did DIY $1 modification to Auto Disk to drop smaller charges, Titegroup metered consistently with .1 gr down to 2.6 grains -
https://www.thehighroad.org/index.php?threads/working-diy-micro-auto-disk.741988/page-2#post-9495037
I'm not sure if that article is the same one I used as the basis for my mod but it is nearly the same. I drilled and tapped the side of a spare disc and threaded a screw into one of the openings allowing charge volume adjustments. A little trial and error later and I was getting better results that the stock 0.32cc hole.
BTW, I also bought one of the eBay copies of the Lee Micro-Disc. This tended to leak more powder that the normal discs but delivered smaller charges.
I also bought the Lee Micro-adjustable Charge Bar hoping it would be better, but at the smallest charges it also saw inconsistent charges with Titegroup. It was no better than the 0.32cc disc.
I recently bought a Lee Deluxe Perfect Powder measure and have not yet tried small Titegroup charges to see it it offers more options. Unlike the disc system, the drum system doesn't actually have a minimum volume. 0.32cc or smaller should be no problem.
Just to be clear, I have no issue with Titegoup when loading 115gr and 124gr bullets because they don't use the smallest disc charge opening. But I have been working on subsonic 9mm loads for use with a suppressor so have been leaning towards more 147gr loads. Just to give you an idea... with 147gr bullets and Titegroup I have only two charges (two smallest charge volumes : 3.6gr~4.0gr) to work from using the Lee Pro Disc, but with Power Pistol I easily have four or more charges that work (3.5gr~5.0gr) because of the larger volume needed. Titegroup is only a problem for me because it is at the very lowest end of the disc systems capability.