Bullets DON'T Pierce Nodes & Trees in Rust, But What Can They Pierce?

Bullets seldom pierce things in Rust, but there are objects that allow for pierce, and they happen to have some unique damage reduction rules applied.
UPDATE:
Courtesy of Ta1ha in the comments, 5.56 can also pierce small furnaces
▬▬ Links ▬▬
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Chapters:
0:00 Intro
0:12 Barrels
0:30 Animals
0:43 Twig
0:55 Glass
1:05 Water

EDIT: Okay, technically animal piercing reduces by more like 60-63% than 67%

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