Meh. It depends on how it's done. Most machine shops will bore so that they can sneak up on the actual size with a hone.
I am still old school. I prefer to mic a piston, bore a hole. Number the piston for that hole and repeat. Nothing like getting it dead right.
That said, for the most part, that's not necessary anymore, because modern piston technology has pretty much made sets exact. I still like my way better. lol
