I don't know. Does this look okay? This is after a couple thousand rounds of coated bullets through a Bowers VERS-9S.
It got to the point a 9mm wouldn't go through without rubbing on the buildup. Had I continued using it this way, I expect I would have started getting baffle strikes pretty soon.
The buildup is every bit as bad as with bare lead, but the crud is much harder to clean out. Fortunately, I can send the can back to Bowers and they will replace the guts for the cost of shipping.
But after having this happen in a couple of cans, I thought I'd try an experiment. It turns out most of the 9mm barrels I checked were oversized. Up to around a .358" bore. So even a .356" bullet is going to be on the small side.
Running 400 .356" bullets, and then the same number of .358" bullets, I got much less buildup with the larger bullets. But then switching to a plated .3555" bullet, the buildup was almost nonexistent. Long write-up with photos and discussion over at
http://www.ar15.com/forums/t_6_42/4...ding-up-in-silencers-MORE-UPDATE-1-14-17.html
Scroll down to the bottom for results.
My take-away was that coated bullets don't tend to lead the barrel. But I'll stick with plated or jacketed for suppressor use.