Todd at pistol-training.com does these 50,000 round pistol tests. His latest one is a Springfield Custom Shop 9mm 1911. Having gone through 53,000 rounds now, the first 1/3 of the rifling in the barrel has worn away. The pistol was clamped into a Ransom rest for an accuracy test.
A 10-shot group was fired, with Federal match ammo, at 35 yards. The group measured 2.04", which is better than most pistols will shoot new, out of the box, at 25 yards.
I suppose that is a testament to the accuracy you can get out of a 1911 with a hand-fitted barrel.