We have built several 28 Nosler's, and I have shot and dialed in several. I have had great accuracy results with the bullets we have tried- 180 VLD, 195 Hybrid, 175 ELD-X.
Barrel life, if you get 800 rounds, I'd say that's good. The 26 Nosler was yielding about 400-500 rounds. The 28 will yield a little more, but not much. Shoot it slow. But, that's why they make extra barrels!