I was told by my silencer dealer, and info online has confirmed, that you aren't supposed to shoot exposed lead bullets through a silencer, but you can so long as you clean their remove the lead from the baffles. The leading won't permanently damage the baffles as long as you clean the baffles. If you don't clean the baffles, the lead will harden on the baffles and then 'weld' itself onto the baffles, eventually damaging the baffles in the silencer.
That's my understanding.
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