So the lube doesn't cause issues with powder? Or is it such a small amount that none of the lube gets inside the case when you swirl the brass in the bucket?
TIA
Spray/soak the lube, any lube, on 2 30cal patches, put 'em an empty plastic tub, add the brass, cover it, swirl/tumble it around for 30sec/1 minute...done.
I don't use any special lube, just oil/lube I have on hand that I consider to be the right viscosity.
Have even used Bag Balm a time or two, as it's mostly Lanolin.
If you can see the lube on the cases, you have used too much
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None of the lube will get into the inside of the case/primer pocket, just the outside...and on the open edge, to be lube for the expander.
I leave the moistened patches in the tub or Zip Lok bag for the next batch, adding lube to them when needed.
All the "sucked back in" primers I have experienced are on range brass with crimped primers
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Tapering the primer pin down to half it's diameter at about the same angle as a sharpened pencil and then balling the end will reduce primer sticking, by a lot.
All that is done spinning the pin in a hand-drill and reshaping the end with a hard stone.
Checkout the tip in my sig line, will get you out of trouble when a primer gets sucked back in.