In the video I posted, Tim explains the 'sticky chamber' issue; that it's chamber fouling due to combustion gases getting past the less ductile steel case, not the high-temperature lacquer.
My experience is 2-3000rd of steel and brass through my SU16. Finally, I had a brass case stick and ruined a cleaning rod driving it out. After seeing Tim's video, I gave the chamber a good scrub, and the rifle again ran faultlessly.
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