I shoot barnes 250gr aswell. I was shooting the mz but ran out. So now I grabbed a box of xpb 454 (.451) casual bullets. They're identical except for a ring mid way down the bullet. Shoot great and designed to expand at a little slower speed from my understanding. Dropped my powder charge from 110gr to 100gr. Tightened my groups slightly at 100yds as a result.
Alot cheaper than mz's. And just buy some crush rib sabots....which I had to do anyway with the mz bullets as they loaded extremely stiff in my barrel with the stock sabots.