A good gun done right, doesn't need to be "broken in"; that's an urban myth & a fallback for a poor gunsmith/product.
Verifying reliability (different from durability) does need to be done with either various or a specific ammo.
MM
BIG BS flag here. A friend of mine built most of the Bianchi Cup top finishers guns last year. When he build a 1911, he might put a 1000rds or more through it before the customer touches it. Don't make yourself look stupid and say he doesn't know what he is doing.
I don't think a smith at that level, ensuring a Bianchi Cup
pistola is worthy of his name should be compared to an out of the box work gun.
I think a variety of ammo should be put through a duty gun before you go to work. Putting a number on it is a bit silly IMO.
Travis