IMO barrel break in is a joke.
1. fit, chamber, crown, engrave the barrel, get it blued and sight it in and go hunting.
2. Take your time sighting it in as it may require several different loads to find a good load.....clean it every fifty rounds and after you find a good load don't clean the barrel....it's ready to go hunting.
I've installed dozens of new barrels (mostly Douglas and Shilen) and finally decided that I couldn't see an advantage to "breaking it in"....same with moly coating.....another waste of time and money!