I do not wire brush the barrel every time. I usually wire brush it about every third time. I do run Birchwood Casey Bore Scrubber on a couple patches and work the barrel over good with that which from my past experiences I find removes about anything in the barrel it comes in contact with.

So far after putting over two hundred conicals through the UM I have yet to see a sign of leading. I think this is due to the fact that I am only pushing them between 1300-1450fps which usually is not a speed where serious leading problems occur.