I have a Lee disk powder measure that I adapted to my RCBS Green Machine. I purchased the adjustable measure as an accessory with it. The adjustable measure has a long narrow metering slit for the powder to drop into. I experienced powder bridging with smaller powder charges, especially the flake powders, such as Clays, because of this design. I had squibs using both Clays and Bullseye in the 45 ACP. I went back to the fixed disks.
I believe if fine grained ball powders were being used, that would be unlikely to bridge, or you were using larger charges of powder for the 357 or 44 magnums, it should work satisfactory, as the charge bar would be opened up considerable more, and powder bridging would be unlikely.
A good practice if you are single stage reloading, is after charging your cases, hold the loading block under the light, and examine each case for powder level. If one looks different, dump the powder and recharge it.