What is 20mm in US caliber specs? - TheGunZone
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WebFeb 18, 2024 · The “20mm” designation refers to the diameter of the bullet, which is approximately 0.787 inches. This makes the 20mm round significantly larger than standard ammunition and gives it a greater impact and destructive force. The 20mm caliber is typically used in heavy weapons such as aircraft cannons, anti-aircraft guns, and naval …
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