Cleaning up after shooting .38 Special in a 357 magnum?

[Davem]

And, for whatever it is worth, I've thought about this one because I too have shot a lot of .38 specials in a .357 chamber.  I think you might possibly get a small amount of wear in the space differential.  Ideally it would probably be better to get 357 cases and load them down to 38 special levels for target practice. You'd have to make sure of your load, just going to the same OAL on a 38 spl. may not do because the longer 357 case is decreasing the area occupied by the powder. But, as I said, I've shot thousands of 38 in 357 without any noticeable issues.
   And, that brass screen really works well, as stated dip in solvent before using.