Well, I thought I was the only one in the world
that since starting formal comp in 1957, could
get a "clean" barrel to shoot straight.

Latest ed. of Guns & Game CZ 527 .204 test by
Andy Montgomery (Pro shooter).
Quote:"Barrel run in consisted of two shots at
50yds,clean, two shots at 100yd.,clean, then the
above group." (Which was 0.13 at 100 yds.)

Aussies, correct me if I'm wrong, but I've never
noticed we have a problem getting a clean barrel
to shoot. But then we don't tend to fawn over
our best shots and what they say and do.
It's more like, "silly dork is/ is not using
moly projectiles. Still, he can shoot OK.

In bench rest I thought the sighters were to check wind estimation, which I think they can do
on another target during a shoot?

Anyway regardless of Mr RIP and Co. all my initial test groups are from a clean barrel.
Sure beats going around with a bore rusting up
all season. (Our season is all year.)
John L.

In the quote you posted the author is breaking in the barrel to help give the barrel its best accuracy and barrel life. Barrel break in DOES make a difference in the amount of fouling, shot consistency, and barrel llife. I dont think his comments had anything to do with the ability of the barrel to group clean or dirty, but simply a coment on how it grouped after doing his break in process.

A short break in.
The point is that he fired the first shot of the
group with a clean barrel, the rest of the group
was not from a clean barrel.
After 800+ shots my .223 does the same Po Impact
clean or dirty, but RIP & Co can't get that to
happen.
John L.