What ammo are they testing the rifle with? What are their protocols (what position is the “smith” shooting from, how many rounds per group, any cleaning or break in procedure before doing a group for record?) How good of a shooter are they?
I find this fascinating and insane at the same time.
Unless your gunsmith is located at Fort Moore and works for the U.S. Army Marksmanship Unit, then you have way more trust in your gunsmith than I would.
Why don’t you spend a box of ammo or 5-10 rounds of several boxes, at least, to get to know the rifle to see if it’s accurate for you and your ammo, and so see if you like how it shoots… for you?