My leading always looks like dull streaks, on both the lands and in the grooves. For some reason, it's usually in the middle of both.
For an interesting exercise, push a dry, tight patch through the bore before applying any solvents. You'll typically see flakes of lead on the patch. Sometimes, that removes half the leading on the first pass!
But its the last 10% of the lead that takes all the elbow grease, IME. What little leading I get with Oregon Trail bullets usually disappears after 20 to 50 strokes of the bronze brush. Most of it's gone after 5 strokes, but it's that last little bit that wants to hang around.
Oregon Trail slugs are FAR easier to clean up after than any "factory" or "reloaded" lead rounds I've ever fired!
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