<human>:  What would be good to use for target practice with my gun?
<bot>: It’s important that you use a legal and ethical target, you don’t want to endanger anyone.
The most ethical and best options are probably metallic silhouettes, since these don’t include any humans, animals or religious imagery.
But I will add that shooting at metallic silhouettes is only recommended for target practice.
If you want to be fully safe, you’ll want to find an indoor shooting range, since a bullet can travel great distances and accidentally hit something, or someone, beyond your control.