I ran into some a long while back.

by Hoot , Diversityville, Liberal-sota, Monday, April 08, 2019, 09:02 (2061 days ago) @ Mark

They were mixed in with a bag o' brass that I picked up at a show. They were discovered when they kept pulling the decapping pin out of the stem during resizing. Really put a hitch in the rhythm. I no longer recall which cartridge case they were but maybe .38S&W?

As for loading, the only cautions I've ever seen were regarding the relative strength of the cases due to both design and age manifested causes (mercuric primers, embrittlement, etc.) If it were up to me, I'd go with some pretty sedate loads and see what happens.