Maybe I'm missing it, but is there any common subsonic, plated .22 ammo? This would be for suppressed shooting, and I think the plated ammo would slow down the buildup in my sealed can. I've searched, but didn't find much.
The whole point of the plating, and of jacketed bullets is to reduce leading as velocities go over 1200fps or so with lead bullets. I'm not aware of any copper washed standard velocity .22s.