Real Common
That's no big deal, I would venture a guess that quite a few shooters have to bump the shoulder just a tad on the 220 Russian in order to get it to chamber without any fear of galling the luggs.
As an add on to what Steave said, I put a very thin film of Emperial Sizing Wax on my cases when fire forming. Keeps the case walls from gripping the chamber walls too aggresivly so as to allow the case to fully form to the chamber and reach the proper length.
One caution if you do use oil. As Steve said, the emphasis is on a very thin coat. Oil is a liguid, and any trapped accumilation would cause a hydraulic bubble in the case when fired..........jackie