20×110mm USN
cold War-era American autocannon cartridge
The 20×110mm USN (also known as 20×110mm US Navy and 20mm Mk-100 Series) is an autocannon cartridge developed by the US Navy after World War II for use in Mk 11 and Mk 12 autocannons. They are called the Mk 100 series as they range from Mk 101 to Mk 109.
It has the same rim diameter as the 20×102mm but a different length and contour. It is not interchangeable with any other 20×110mm cartridge.
Available loads
Some of the available loads for the 20×110mm USN are as follows:
There is also a cartridge, 20 mm, dummy, Mk 103 Mod 0 (USN) which is an inert round. It has an empty primer pocket and holes in the case or a plugged primer pocket. It may be empty or filled with inert material. The projectile is usually brass or bronze plated.
The public source identifies “20×110mm USN” as cold War-era American autocannon cartridge. This brief keeps that definition visible, then builds a research path around 110mm, cold and War-era.
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The record creator and administrative purpose are central evidence, because official documentation reflects both action and institutional priorities. The source revision retrieved here is dated Feb 10, 2026. The linked authority identifier is Q56303965. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “20×110mm USN” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.