20mm Mattis Cartridge Renderings And Descriptions

I don't know how you imagine the 20mm Mattis cartridge from my Code Of Armor:Vengeance books to look, but here's my digital sketch of it.

Short, pudgy, about the length of a AA battery. 

And nasty.

Actual brass works out to 20x35mm in regular nomenclature.  Cartridge Overall Length is 50mm for feeding from standard magazines.

Projectiles vary.  Hardball, cavitators, high explosives/dual purpose, hollowpoints, and spike rounds with fragmenting jackets.  Versatile, no?

There's not a lot of room in that case once the projectile is seated, so I handwave the fact that propellants will be more advanced in a sci-fi setting.

Here are the worldbuilding snippets from the books that describe the cartridge, from the perspective of an interworld weapons journal.

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 “Named for one of their fiercest war chieftains, the 20mm Mattis cartridge has served the Ascended well for a number of centuries, despite the advancement of portable energy weapons. The recoil of the hard-hitting round is substantial, but even Humans, parallel-world cousins to the Ascended, can use the round given sufficient conditioning and training.”

“20mm Mattis can feed from box magazines, drums, tubes, and even more primitive revolvers with the use of radial spacer-clips.”

-Daroog's Interworld Guide Of Ballistic

Cartridges, Ninth Edition

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 “The 20mm Mattis, also known as the .787 Self Defense, is a classic chambering for both handguns, carbines, and rifles. It has a decades-old, well-earned reputation as a sentient-stopper. Loadouts vary across the technological spectrum, from copper-jacketed tungsten projectiles to more advanced thermite rounds with EMP kickers for tougher targets.”

“The round first came to Junctionworld during the Ascended Migration, and caught on quickly with larger-framed beings. The Ascended, an advanced and innovative species, brought it to the interdimensional crossroads as they fled those mechanical terrors of their own making, The Purge. Even a Class 4 Purgehound can be stopped dead (if such a term can be applied to the abominations) in its tracks by a well-placed round of 20mm Mattis to the processor cortex assembly.”

-Daroog's Interworld Guide Of Ballistic

Cartridges, Ninth Edition

Enjoy!

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Code Of Armor: Vengeance, Part Two

Pilot Jessica Kramer is a mech gladiator fighting long odds, personal demons, and a rigged system in order to solve the murder of her brother in an alien arena.

 Here's the Kindle version.  $2.99, or free with Kindle Unlimited.
https://www.amazon.com/dp/B0772D3Q92

 And here's the Paperback version. $7.50 delivered to your door, with Amazon Prime.

https://www.amazon.com/dp/1973199394