Yeah I wouldn't recommend snorting, smoking or shooting oxycodone. The thing is, even if you do wash the coating off of a oxycodone 10mg k/56 before you snort, smoke or shoot it, the pill itself contains "fillers" which are chemicals used to bind all the active ingredients together.
These pills are designed to be ingested, so the filler passes harmlessly through the bowels and comes out as waste.
If you inject, smoke or snort, you are putting that chemical directly into your bloodstream instead.
What are the effects?
It could be nothing, it could be severely reduced lung functions that put your life at risk... It depends on the dosage and the filler in question.
My opinion: is it really worth the risk finding out?