British standard ordnance weights and measurements
- British standard ordnance weights and measurements
The British standard ordnance weights and measurements for the artillery were established by the Master General of Ordnance in 1764, and these were not altered until 1919Fact|date=June 2008 when the metric system was additionally introduced.
This system has largely been replaced by a calibre system, which is the standard today for most weapon systems in use by the World's armed forces.
The 18th century standards were based on projectile weight, and dated back to use of muzzle loaded cannons which fired solid cannonballs. The designations bore only an approximate relationship to the actual weight of the projectile when it was applied to modern artillery.
The table below lists the metric and Imperial calibres of various British weapons, which utilised the standard after 1919:
References
*Rottman, Gordon L.: "Elite 124 - World War II Infantry Anti-Tank Tactics", Osprey publishing, ISBN 1-84176-842-1 p.16
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