Take a look at the rimfire magic website, the reason they recrown all remmington 700's is they have found that the factory crowning is sometimes off centre and would badly affect accuracy.
They appear to have taken the decision that it is easier to recrown them all than miss a bad one, it is a very minor modification that will ensure the bullet leaves the barrel in a consistent way.
I have one of their .223 tactical models that yesterday shot a 50 metre 0.25 inch group so it certainly does no harm to recrown a new barrel