If barrel breakin was not nessary for the over all performance
then barrel makers like Lilja and shillen would not recomend
that you do it.
Like all other questions asked about brass,bullets,powder,
calibre,make of weapon, action ,ETC. there will always be
opposing sides to any question( this is good because it makes
you think outside of the box ).
And depending on what your trying to achieve breakin may
not be nessary on a lapped stainless barrel (the lapping
removes tool marks and improves/minimizes fouling.)
I have seen barrels that took close to 100rds to finally shoot in
that were not broke in first and they required lots of cleaning
to remove fouling.
The method that works for me is shoot 20rds cleaning between
each round fired ( when you do this it requires less brushing and
removes the carbon so the next round is fired in a clean bore
reducing the amount of ware to the bore).
And yes EVERY shot reduces barrel life but (I) believe that a clean
cool barrel reduces ware increasing barrel life.
So you be the judge as to whether you breakin or not.
J E CUSTOM