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McCourry Institute of Ballistics wetpack testing on the 404-gr Shock hammer was done with impact speeds of about 2350 fps and about 2550 fps.
Penetration did not increase in depth with higher velocity,
stayed about 23" for both impact speeds,
just increased the explosive trauma from about 3" to 7" depth along the wound channel.
Petals came off by about 3" depth for both impact velocities.
Here is the lower velocity impact results, per MIB:







Michael McCourry's work.

The sleek copper nose allows high BC for high-velocity delivery at impact, down range.
Then it leaves a wicked-short penetrator with CG forward, still going pretty fast,
not a perfectly square nose, slightly rounded off and slightly widened.
Good enough for live game.
Near 2 feet of MIB wetpack is good enough.
Slow-Mo video of the 404-gr Shock hammer in ballistic gelatin sure would be interesting.