I have been using them for a few years now in a 30-06 and 7x57 in front of factory Superformance.
Upon inspection both before and after killing several deer, I would say they are simply a proven Interlock with a plastic tip. They don't seem to expand any different and they fly the same out to 300 yards.
Now the "Superformance" claim is a little bit out there. I have shot Superformance SST, GMX and Custom Interlocks in to basically the same hole at 100 yards and minute of clay pigeon out to 200. If they are not all packing the same punch, they are really close.
Anyway, extremely consistent and accurate for me. I won't be using anything else as long as these are available.
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