LOL I can't help it, some of the claims are pretty fun. Link here for those who want to read them. Cavity Back Advantage

This one is pretty good:
2. BY INCREASING EFFECTIVE CASE CAPACITY THE CAVITY ALLOWS THE CARTRIDGE TO “BREATHE” BETTER. RESULTING IN A SLIGHTLY COOLER BURN AND SLIGHTLY LESS VIOLENT ACTIVITY INSIDE THE CARTRIDGE CASE DURING PROPELLANT IGNITION.

The cartridge "breathes" better with this bullet, and burns cooler too. Sweet! Why aren't we all using these?


This one is good too, for those who understand pressure vs. surface area and the resulting forces:
6. THOROUGH TESTING HAS PROVEN THE CAVITY BACK SMOOTHES OUT THE PRESSURE CURVE BY CREATING A HEMISPHERICAL POWDER CONTAINMENT CHAMBER. AS THE POWDER BURNS AND PUSHES ON THE CHAMBER INSTEAD OF A FLAT OR DISHED BULLET BASE THE BULLET STARTS ITS MOVEMENT SOONER DUE TO THE INCREASED SURFACE AREA. THIS LESSENS THE PRESSURE SPIKE AS THE BULLET ENTERS THE RIFLING.

Cool, so drilling a hole in the bullet base means more surface area for pressure to push the bullet. It should go faster then, right?
(Yeah, that's not how this works. That's not how any of this works.)

Whoever wrote this stuff has made a fool of themselves, and doesn't even know enough to realize it.