interesting, i did not know that
so they are just using the design because it is better ballistically, and not for expansion?
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My thought...
Apparently a hollow cavity shifts the balance point slightly which is supposed to make it more accurate.
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When MG designed their hollow point, I don't think they had terminal ballistic performance as a primary goal.
I just remembered that I found a MG loaded round at the range, so I dissected it.
See the comparison between MG and Hornady XTP which was designed from the ground up for "Extreme Terminal Performance"
Note the difference in depth of the cavity.
HAP= hornady action pistol
XTP=hornady extreme terminal performance
MG=montana gold