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The Hawkins 7.5-inch gun's barrel length

A Hawkins modeling question supplies the 7.5-inch gun's length in metres, inches, and calibres.

7.5-inch Guns Gun Nomenclature Hawkins Class Heavy Cruisers Naval Gunnery

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Question

How long was the Hawkins-class cruiser's 7.5-inch gun?

Short answer

About 8.6 metres or 337.5 inches, described as 45 calibres long.

Notes

The Hawkins cruiser's 7.5-inch gun is described as 45 calibres long. The stated length is 337.5 inches, or about 8.6 metres. The calibre figure expresses barrel length in relation to bore diameter.