Just do a search on YouTube. Look up iraqvereran8888. He tests a solid copper round (which is the one I carry) vs various hollow points. They do make it through the glass. The hollow points actually behave just like FMJ's and plug up and pass right through the block.
I don't understand your insinuation. Is it that you think copper plated lead won't penetrate? Even .380's penetrate Auto Glass. A hollow point is a hollowed out FMJ. Lead is still used.