cosmoline
I too shoot a northwest trade gun, smooth bore, about 20 gauge.
A couple of years ago, I was shooting on an outdoor range and noticed my fired patches smoking in the dry grass. Yikes!
I now use a cushion wad between the powder load and the .600 round ball I fire. My patches are pillow ticking from wal mart. I make sure they are well lubed with bore butter. No more smoking patches.
Happy shooting!
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