Cub Driver wrote:

I've often been amused by the thought that shooting at a man obliges
the shooter to use a brass-jacketed round, while shooting at a deer
obliges him to use soft-nosed shells (or a lead slug, in the county
where I live).

Hunting ammo for rifles is also brass-jacketed. The difference between it and
military rounds is that the jacket on military rounds covers the entire bullet;
in hunting rounds, the tip is left exposed. This gives the military round more
range and decreases the chance that the round will kill the enemy soldier (as
agreed to by the Hague Convention). The hunting round expands more readily on
contact and is designed to kill as humanely (ie: rapidly) as possible.

Rounds used by the police depend on local policies. The policy of the FBI is to
use rounds deliberately designed to kill as certainly and rapidly as possible.
They are not fully jacketed. The so-called "cop-killer" rounds were designed to
be used by the police to punch through car doors. They're jacketed.

Unjacketed lead bullets are used almost exclusively in some types of black powder
firearms and in shotguns.

George Patterson
Great discoveries are not announced with "Eureka!". What's usually said is
"Hummmmm... That's interesting...."