D-Lead is a very good company for deleading that i use obsessively, when shooting
I once called them and talked to an engineer about lead for like 1.5 hours. I think it really surprised him someone was so interested and he was happy to share.
For those that aren’t aware, the primer in cartridges typically have lead styphnate, barium nitrate, and tetrazene, among other things. So even if your bullets have a complete copper jacket, you still get significant lead particulate exposure, especially indoors or with a suppressor with high back pressure. No idea if whatever smokeless powders are used are doped with something fun or not. Bullets with exposed lead have additional concerns, as the surface gets flash melted/vaporized in addition to particles generated from barrel friction. This all adds up.
Never clean guns/suppressors with vinegar (acetic acid), because that just creates lead acetate, a highly bioavailabile form of lead that makes elemental lead look safe by comparison, and legally and morally requires proper hazardous waste disposal.
Fortunately there are alternatives showing up now, including some with lead free primers, but damn if it isn’t expensive, and as expected copper/zinc/mild steel bullets have trouble competing with lead for performance because it comes down to mass.
But it's still a concern, so hands, arms, and face should definitely be washed after loading/shooting/cleaning. Extended firing sessions should be followed by a shower and clothes change.
Fortunately, the elemental lead in cast pellets/bullets is not very bioavailable, however it's still a good idea to minimize exposure.
The jacket just reduces lead fouling.