I shot clays this weekend, starting with the barrel squeaky clean as it just came back from the smith, which is another story, I'll be checking the straps on my gunslips aren't about to come off in future though
Afterward (before any cleaning) the barrel was still bright and shiny with only a couple of slight streaks in the forcing cone. I know that doesnt mean there is no fouling though, so I pulled my brand new boresnake through it 3 times, it came out dirty, but the barrel didn't look any different to me.
Hasn't convinced me that cleaning is worthwhile.