I present to you, the Aguila 1 3/4" mini-shell:

https://www.targetsportsusa.com/aguila-minishell-12-gauge-ammo-1-34-78-oz-slug-1c128974-p-76585.aspx

Just did the math and in my 870 with my spring snow goose mag can hold... like.... (counting on fingers)........15 or something, LMAO

The DIPCHIT ADD, after a morning of drinking:

You despair, repeatedly, constantly! daily basis?
A despair ninny.
Sack up, despire ninny.