Spear Grand Slam bullets?

I wrote an article about 30 years ago for Handloader Digest where I tested a pile of bullets for terminal performance, mostly with 30 caliber but also others. Photos of a few Grand Slams are attached as is the diagram from Speer regarding the Grand Slam. The bullets were tested at various velocities. the conclusion with the Grand Slams was that they were better than the standard cup & core bullets IF the velocity didn't exceed the bullets limits- which when exceeded resulted in core separation- however the separation was well after the bullet would have killed the animal if shot at any "normal" angle. These were the original edition of Grand Slams.
 

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