I have a RRA PP and my break in went like this:
break new rifle dwon and clean action and barrel,
5 shots clean barrel
6-75 no clean groups start to open up
clean, foul barrel and it goes right back to shooting .5 inches
The Wilson Stainless match barrels in those rifles are supposedly lapped when they leave the factory
By the way, the only fouling I got out of mine was powder, I uses copper remover and NONE was present.
RRA actually says somewhere break in isn't necessary on these barrels.
If it makes you feel better you may want to chant over it some and sprinkle some fairy dust on it it will do just as much good.