Thanks again for the good info.
I'm only using the Lewis Kit to make sure I have no lead or copper whatsoever, to make the tests as accurate as possible.
And I just run a patch with IOSSO through to do a final cleanup.
I'm using lead bullets in .38 Special because that's what was recommended by many of the other silhouette shooters.
Just got some .357 brass yesterday, so some time this week I'll load the Speer 158 gr JSP's and see how they shoot at mild .357 levels.
Thanks again for all info.
Shooting more, typing less