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[wierd]

The combination of these factors (Soft barrel metal, high velocities requiring increased chamber pressures, and lighter metals being harder metals) all add up.

(The rockwell hardness of condition H04 copper is 80-90 Rockwell B)
https://www.mill-max.com/material_properties
(The rockwell hardness of 415 stainless is (computed, since brenell hardness is given for the 415 datasheet: 320) between 34 (Rockwell C) and 67 (Rockwell A). This makes H04 copper significantly harder than the 415 stainless.
http://www.engineersedge.com/hardness_conversion.htm

The equivalent hardness of the H04 copper would be closer to 670 on the brenell scale.


These are NOT trivial engineering problems to overcome. This is why Bismuth is an "Acceptable" alternative to lead. It is sufficiently soft, and sufficiently dense, while being sufficiently nontoxic, that existing gun metal compositions can handle the increased chamber pressures needed to fire them.

The problem is that bismuth is too expensive.

[Neonivek]

Also checking those laws they aren't banning lead bullets they are banning lead bullets in very specific situations.