Your fingers would literally have to be dripping with oil. And even then, several people have done tests where they soaked primers in oil overnight and they still went 'snap' no problem.
My opinion: use magnum primers.
Agreed that the natural oils in your hands virtually certainly wouldnt cause any issue, it is very easy to have many other oils on your hands while reloading depending on what you were doing... case lube, press lube, gun oil, wd-40, etc... and if you don't use primer flip trays or primer tubes, you increase the chances of something going wrong.
It's likely not a major issue, but still something worth considering to reduce all variables.


















































