Often after an extended shooting session; I'll run a Hoppe's 9 patch down, wait 2 min, then patch it out. Then one more good soaking with Hoppe's 9, no patching out, pack up and drive home (about an hour, but sometimes we stop off for lunch). Once home; patch it dry, done.
My L-W 260 barrel is the only non-factory tube I own. After round #7 (15 years ago) during break-in (shoot one/clean one) I never saw copper coming out again. Ever.. The Hoppe's is to stay ahead of carbon rings. I try never to do a complete bore strip cleaning.
The factory barrels sometimes get more attention. I just got one of the borescopes reported recently onsite here. I pretty much expect I'll be using it to figure out whether anything should change in my cleaning 'method'.
I never use a metallic brush, but will use a nylon one to spread the solvent thoroughly before an overnight soak for the "end of season" cleaning that precedes my off-season storage.
Brushes trouble me. I was taught to take my time; to let the solvent and time do the work.
Season startup involves some foulers to reseason the bore before the year's shooting. Ten's plenty.
If it sounds like I don't have a really set and solid cleaning regimen, that's an accurate assessment. Mostly, that's because I never had a good handle on what's happening inside the bore. With the borescope, now I'll know more.
My bores had been scoped briefly a few times previously. What I saw at first was alarming, no doubt about it.
But I did what I always do when I have doubts. I shot the rifles, and compared outcomes against the borescope. The rifles all shot fine.
So the conclusion is that information can be interesting, but the target always tells the tale.
The important thing to see is when the bore info changes. Shoot, evaluate, make a conclusion.
Watch the throats. They get checkered. When a checker disappears, that usually accompanies the end of the barrel's useful life. That checkering is the result of the heat cycle from the firing of each shot; and the hotter the load, the more pronounced the checkering.
Keep records; I have too many rifles to keep that stuff in my head.
Actually, I have too many rifles, period. That's what I have Grandkids for...
Greg