Just to muddify the speed and energy discussion...maybe bullet rotation works to create a wound channel with a fragmenting bullet?
I had always thought the Cutting Edge mth bullet , shedding its petals( at high rpm) would be devastating on elk, and the base keeps on going. The Nosler partition do the same thing.
I have not tried the mth on elk but have used the NP.
I have not sprinkled any neutrino's over the Nosler Partition handloads , either...and they worked well
Cheers
some considerations: spin rates usually given in rpm would make more sense if they were quoted in the short time of flight of the bullets.
regardless of the spin rate the actual rotation the bullet makes is based on the twist. ex. a 1 in 8 twist must still travel 8 inch thru the animal to complete 1 rotation.
If the angular torque moment on the bullet was significantly higher than retention from the "jacket" it would be a different case,
solid wouldn't have this problem.
