Looks like text book performance to me.
If your textbook is old enough. Perfect performance, 1920-1980 style.
No exit wound when using a 280 on a mere deer? Sorry, not good enough. Not even sort of.
By that reasoning, a 340 Weatherby is lacking when loaded with 225s, the Barnes mono version, on mere caribou? (We're talking <300 lb, deer-sized animals here as well.)
I have had a number of occasions when I've found fault with Barnes monos. This example, however, has not been one of them.