Since the .22-250 doesn't headspace on the case mouth, the only critical length dimension is max. As long as there is enough case neck to correctly seat (and hold) the bullet, they will work. Accuracy is going to depend on YOUR rifle, as much as anything.
There is no need to make cases shorter than the "trim to" length, but if you have some a few thousandths shorter, don't freak. Odds are they will work just fine and you won't notice the difference.