The OP seems to be digging in on an indefensible position.
You cannot look at just one single application and call something the last word .... I can assure you that a barrys plated 32 caliber bullet will have miserable results from a full house loaded 32 Winchester Special.
In a role such as this, anyone interested in trying it will have to baby a plated bullet to make it work.
Gas checked cast is far better ... but this too will reach its practical limits long before we hit full power loads in a 300 Winchester Magnum. this is what jacketed bullets are for ....
Jacketed will not fair all that well in a 50 BMG based 338 wildcat. This demands a copper solid with perhaps steel cores to hold up to being fired in such a ridiculous cartridge.
Meanwhile, such a bullet would give up a great deal of performance in a 9MM

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it just needs more voltage