Bore Brushing--How Much is Too Much?
Here is a link to an article on 6mmbr. The concensus is - there is none.
Very good article from some really good shooters interviewed. Seems that the majority of the shooters agree that we clean too aggressively and too often.
I have noticed that my 300 mag fouls REALLY bad. If I shoot 3 rounds it takes 2 days to get the coper out. It is a Shilen cm barrels and shoots really good (.380) for 12 to 15 rounds then falls apart. My Hart 6mmbr can shoot a 100 rounds and cleans out with 3 shooters choice patches.
The 100 to 200 yard match guys clean more and the barrels last for fewer shots.
It seems to be barrel specific as to what works best. I clean until the patch is clean. I don't know if that is the way to go but it works for me.