Rude Robert,
It sounds from several of the fellows like lube problems in either the cases or the measures are the most common factor with bridging Varget. One thing about Varget is that it has that greenish gold appearance that tells me it is not coated in graphite like most stick powders, so conditioning your measure may well be what you need to do.
Might I suggest you do a powder measure reliability run-through? First, pull it from the machine and disassemble it. Clean the lubricants out by pan soaking and toothbrushing in odorless mineral spirits. I am suggesting that solvent because I don't think it is likely to attack the powder hopper plastic, but check with Hornady first to be sure (or test a spot). They may tell you to use alcohol instead?
Once the grease is gone, take a tube of graphite from the hardware store and sprinkle some on a clean rag and rub it into the drum and the drum journal in the body casting. Also into the drum metering hole and the actuating mechanism and tube and anywhere else you can reach that powder might come in contact with except plastic parts.
Put the measure back together. Wipe the inside of the powder hopper and any other plastic parts with a clothes dryer sheet. This gets anti-stat on it.
Install an extra baffle in the hopper. You can download a PDF file of baffle templates free from my file repository,
here. Look at the illustration in the instructions of the dual baffle approach.
Put the measure back on the machine. Set it to a minimum charge weight and put your whole tube of graphite into the powder hopper. Cycle it through the measure several time to be sure it gets everywhere powder will go.
That will be a good working prep for all powders, and not just Varget.
As to your cases, see if you can lube them without getting any conventional lube on the necks? Some guys have made up a lube board where they drill a series of neck OD size holes in a board, like the edge of a 2×4, then stick cases into them for spray lubing. Imperial Sizing Wax and Hornady Unique lubes are applied by finger, so avoiding the neck is no issue with them. You can do the old fashioned pad rolling method, too, without the neck or shoulder getting any lube.
Once you have those lubed cases, then dip the necks into a dry lube, like Imperial Dry Neck Lube (just more graphite) or white motor mica dust. Just don't put a wet lube on them.
You may want to disassemble and clean your sizing die, too just to get lube from previous session off of it?