It is the orange MMP sabot. I think they only have one orange .458-.50 one.
Here is a recovered bullet from a shot under 20 yards, entered the front of the chest and almost exited the back of the deer, stopped in one of the rear quarters. Literally cut the heart in half:
Here is what the exit wound looks like on a 110 yd coyote, phenominal bullet:
My longest shot this year was a doe at 140 yds, no pic but she was DRT with lots of damage. The bullet is obviously opening fine.