Science bitch! [2/2]

"Yes please." 

[In order of weakest to strongest. 

1. 9mm: 7,723 rounds 

2. 40mm Grenades: 6,248 grenades

3. .45 ACP: 3,869 rounds 

4. 5.56×45mm NATO: 2,506 rounds 

5. 12-Gauge Shotgun Slug/00 Buckshot: 1,591 shells 

6. 7.62×51mm NATO: 1,164 rounds 

7. 7mm Remington Magnum: 1,100 rounds 

8. 8.6 Blackout: 1,031 rounds

9. .30-06 Springfield: 975 rounds 

10. .500 S&W Magnum: 785 rounds 

11. .50 BMG: 220 rounds.] 

"Tsk. Even the .50 Cal needs over two hundred. Grenades are even weaker than rifles? Come on Exa, this list is bullshit." 

[My lord, the question itself is flawed. The list is accurate when all you want is to generate the required kinetic energy. However, distance, bullet weight, and speed affect penetration. Slower bullets, like the .500 S&W Magnum, are more powerful. But faster rounds, like the .30-06, pierce better. The 40mm has the same issue.]