Like any reasonable billionaire, I want to breed dinosaurs on my private island - big ones. Like, T-Rex big. Of course, one needs a well-armed security force to guard such an endeavor, lest the merchandise escape and begin devouring tourists at will.
However, I'm also the sort of billionaire who loves experimenting with things, and I've also noticed that it's really hard for people to carry around big, heavy, long-ranged, powerful rifles capable of killing beasts like a fully-grown Tyrannosaur. You also really don't want your anti-dinosaur weapons to have the recoil of, say, a .50-caliber anti-material rifle - it bruises the collarbone, you know, and makes it harder for random tourists to use those weapons after the security forces get eaten.
As such, I've decided that my security forces will be armed with - as per the title - automatic shotguns that fire miniaturized anti-tank munitions. Reasonable thing to do, really. My choice of shotgun is the Saiga-12 - nothing out of the ordinary about that, either. However, my choice of ammunition is somewhat less conventional: I'm going hunting with FRAG-12 ammunition.
Apparently, FRAG-12 rounds come in both high-explosive and armor-piercing varieties, and the armor-piercing variety is a shaped charge that can penetrate up to half an inch of steel armor plate - it's essentially a miniaturized high-explosive anti-tank munition.
Shooting FRAG-12 rounds out of a 12-gauge shotgun has a lot less recoil than shooting big bullets out of a big gun (don't ask me why, I leave gun stuff up to my chief of security). Miniature anti-tank munitions are also much cooler than boring old bullets, so they're clearly the better option.
The question: does the shaped charge of a FRAG-12 armor-piercing slug have enough penetration capability to stop a T-Rex if shot at its head or heart?
Please get back to me as soon as possible - I might have (completely hypothetically, of course) have gone through with the whole "dinosaur breeding" thing before I actually placed an order for good anti-dinosaur guns, and there might (also completely hypothetically) be a bit of a situation going on right now.