SmallCaliberCentral

I picked up around 100 pieces of brass already primed but dont know with what primers how can I safley de-prime this brass???

deprime just the same as you would fired brass. just go easy and definately wear safety glasses. i've done it this way quit a few times, with no problems, knock on wood, run your press down on the primers till you feel it touch, then use steady pressure to push them out.
just my humble opinion.

I use the same method futuretrades described. Make sure you wear those safety glasses. I have deprimed many, many cases and have never had any of them detonate.

thanks for the feed back on this question I thought about that but wanted some advice first thanks agian.