16 ounces and 7000 grains to the pound.
When you do the division, one ounce = 437.5 grains.
Not sure your pointed pellets would work out too well - that stuff is supposed to be spin-stabilised along its own long axis. Shot works because even if the individual pellets tumble, it doesn't change the aspect that they present to the air*; and although they don't maintain the same straightline path from the muzzle (at reasonably short distances) a rifle bullet does, patterning remains relatively predictable (all else being equal).
An airgun pellet that tumbles is constantly changing the frontal aspect, and the path will be grossly unpredictable to the point where you may not get much use beyond almost contact range.
* = yes, okay, pellets deform and that does change things, but I'm talking the ideal case here.
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