You can use them safely. You may not get very good accuracy because they will be a little undersize. If you try to drive them very fast you may get a lot of leading because the gases may slip past the base. Then again they may obturate enough to shoot accrurately and have little leading. Try them and see how they work.
As the others said, they will certainly be safe, but likely won't produce much in the way of accuracy, unless they are soft enough and pushed with enough pressure to obturate, or bump up to bore dia. If leading is a problem, you can tumble lube them with Lee tumble lube. If various load tests don't result in satisfactory results, melt em down and cast them into something you like
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