Don't waste your time as inexpensive as some bullets are in bulk...
free may be ok, otherwise a waste of powder. been there done that.
I would disagree, cheap bullets are great for plinking (who cares if you miss a tin can or clay pigeon), fire forming, breaking in a barrel, fire lapping, playing around with reduced loads or even hunting varmints. I think that any trigger time is a good time so never a waste of powder.