RE: Copper foiling
I hunt with some guys who have left their barrels fouled foryearson end. Doesn't seem to matter much though, as they generally shoot at moderate ranges and kill deer just about every year.
I personally can't do that myself.I do generally leave my barrels alone during hunting season, butthey get cleaned after every shooting session the rest of the year. I think the aforementioned example, though, is evidence that some of us, myself included, fret too much about barrel cleanliness I think.