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Be sure to actually WEIGH the charges delivered by your measure (no matter what brand, Lee or Belding & Mull, verify the charge weight). Do this every time you start a loading session, at least\, and periodically thereafter.
Lee's Dippers and Auto-Disks are notorious for delivering less than the estimates in the factory-provided charts. Better than being over. Also, as the powder depth in the hopper varies during the loading session, compaction can cause the more or less powder to be delivered. Some brands of measure and some powders are worse in this regard than others.
If you get an extra disk or two, you can ream out the cavities to deliver precisely the charge you want. Be sure to indelibly mark any disks so modified.
If you find 5.2 grains does not reliably cycle your action, try stiffening your grip (hands, wrists and forearms, all). I found a load for my 45 with which I could induce a failure to cycle at will simply by relaxing my grip. It's useful for malfunction drills.
I have no experience with True Blue gunpowder.
Good luck,
Lost Sheep
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