Shockey uses the Nosler Ballistic Tip MZ bullet or so he says. Its nothing more than a SST type bullet in .458 It did fairly well in Ron's jug testing. Very similar to what ive seen in the 300gr SST weight retention/expansion.
Nosler offers the exact same bullet in bulk 50 packs for 458 SOCOM
458 Caliber 300 Grain
Ballistic Tip Hunting Bullet
Part# 31456
Spitzer Point
Im much more interested in copper 40cal bullets over 200gr that will shoot in sabots. It can be slightly tricky with the current 45x40 sabot selection but it is doable.