I'd steer away from the Nosler Ballistic Tip. They are designed to function properly at non-magnum velocities, and are known for being a bit on the weak (read: frangiable) side even at those speeds. I'd think that there's just too much chance the BT out of a magnum would turn into little more than a glorified varmint bullet at such high speeds, especially if the range gets close.

The Scirocco, on the other hand, is a bonded polymer tipped bullet designed for heavier game and higher velocity cartridges, and should still perform very well on deer without causing excess meat damage, or worse yet, gruesome but not immediately fatal flesh wounds when the bullet fails to hold up on impact.

Mike