There is a big difference between organic and inorganic lead! So much of the fear is unfounded and with blanket reasoning from a lack of knowledge of the difference.

Lead can change properties from organic to inorganic, so it is not totally cut/dry.

You can eat a bullet and you will "pass" a bullet. With NO elevation of lead levels. You can cast bullets with NO elevation in lead as long as you use a thermometer and don't get your pot too hot.. At 1,100F lead will start to vaporize, which is 400F TOO HOT for casting!

Now if you snack on a bullet covered in lead oxide (white dust) that is different.

Firing a gun can raise your levels..not because of the bullet, but because of the lead used in the primer. Lead vapor "may" form from the bullet/barrel friction..but doubtful, because the lead has to heat to 1,100F in order to start to vaporize.

The cast bullet is most likely shielded from most friction because it is riding on a thin oil film of lube soon after rifling engagement. And the lead doesn't boil until 3,180F, way past the melting point of your barrel.

Shoot what you want, but remember the anti-gun crowd wins another battle every time their unfounded lies get parroted by someone that has no foundation in the truth.