Gonna jump in with Rick, Obtunded, and Mystic.
I've only one gun that needed to be worked when it was new. It had a crap barrel (guess everyone cranks out a bad one here and there).
Any of the guns I've had quality barrels on I've never noticed a difference between a break in procedure vs just shooting the next one. (I've done both).
Neither fouled more or less than the other (Between RKS, HS Precision, Rock Creek, Krieger, and the border barrel on my AIAWP).
All have been bore scoped, none looked better or worse than the other (until the barrel was shot out of course). All made good round counts (except the last barrel on my 300WM, but thats my fault, not the barrel manufacture or break in procedure).
Summarizing my break in proceedure, get nice new barrel, shoot and enjoy.