Barrel break in has been beaten to death and no two opinions will be the same.
I also shoot BR so here is mine, After I install I load 20 rounds with the same charge but with 5 different seating depths and go shoot, then take it home and clean as clean as I can. If none of the loads showed promise I do it again with different charges and or seating depths. I would rather shoot than clean and most barrels shoot better fouled anyway.
But the first thing I do is do my home work for the proper load, bullet combo no barrel will shoot good with out it.