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I think reb nailed it. There's a whale of a difference in oils (pun intended.)
Normal finger oils on CLEAN hands are probably not a problem at all. But fingers with a film of sizing lube...well, I wouldn't want to bet on that primer going off.
Primers are factory sealed, usually with a lacquer-like coating over a paper or foil leyer. Right out of the box, you could probably soak them in penetrating oil and most or all of them would still go off.
BUT...
When you seat a primer, the anvil pushes down on that foil layer, likely breaking the seal as it does. So any dab of oil that may hev been present will very likely migrate into the priming pellet. That's death for that primer.
That's why I quit handling primers with my fingers something like 30 years ago. I've used Lee Auto-Prime units ever since. I have one set up for large primers and another set up for small. Very neat, very easy and I almost never have a failure to bang unless I have a gun problem or have made some other bonehead mistake.
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