So to clarify: Every time you chamber a round in a semi-auto there is a risk of the round being seated deeper in the cartridge. Some calibers and firearms are more susceptible to this then others. The issue is: if you continually chamber and unload the same round, the bullet may get pressed into the cartridge and lead to an unsafe rise in pressure. This does happen!
there have been some good old threads on this. I'll see if i can find one.
To the OP question: I would get some calipers (or the glass table-ruler method above) and measure any round in question. If the bullet is set deeper in the case, I would discard it. Some people like to fire them at the range, but this may be dangerous. If the round measures good as new, then you are ok to keep using it.