What is the .300 AMU?

The .300 AMU is a rifle cartridge.

What bullet diameter does the .300 AMU use?

The .300 AMU uses a bullet diameter of 0.308 inches.

The .300 AMU has a Belted, Bottleneck case type.

The .300 AMU uses a Large Rifle (.210") primer.

Rifle

Case Type	Belted, Bottleneck
Primer	Large Rifle (.210")

Dimensions (inches)

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Powder (name or brand)

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Cartridges with the same bullet diameter (0.308")