When I got my rifle back from GA Precision I broke in the new Bartlein barrel with cheep Federal ammo. I followed GAP's break in procedure. I know there are differing opinions concerning barrel break in and I can't say one way or the other if it does any good. I used cheep ammo because I didn't want to use my $61 a box Copper Creek ammo. I knew the rifle probably wouldn't shoot tiny groups because the barrel was set up for Berger bullets. The Copper Creek ammo shot great but my reloads shoot better due to being tuned to the rifle.
I would go ahead and zero at 100yds
I would go ahead and zero at 100yds