The half-cent fee is only the fee paid to the state; that doesn't take into account the cost of actually numbering the bullet, or the economics of the enormous reduction in supply this would cause. It wouldn't make bullets $5000, but it would make them much more expensive than they are now.
I can't see a laser cut number on the back of a lead bullet surviving being fired, let alone the bullet hitting anything.
Using taggants in the lead would work better but that apparently isn't the proposal on the table.
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