I use Glocks. My "break-in" involves proper installation of night sights and running a box of ammo through it. Done.
I did that with a new Glock once. Second time to the range it proved unreliable on any and all JHP's and even after being returned to Glock it was still unreliable on JHP's. This was after "a few mags" of JHP and a couple boxes of FMJ to start off.
You're only cheating yourself.