Primers are not particularly dangerous, but they can go off and damage stuff. Powders can burn pretty fast, but don't explode. Lee says only CCI and Winchester primers are safe in their priming tools, and I don't know why that is. My regular corrective lenses are safety glasses, you can't buy plain glass any more. Even so I wear a face shield. there are some other parts of my face I'd like to keep stock. [8D]