>>37148856>Considering people use .410 to hunt squirrels and rabbits with out tearing them apart, and those 12 gauge mini shells hold the same amount of shot as .410.
Your point stands, but that comparison is a little misleading -- at the very least you should say "magnum .410". It's important to note that minishells in buck and birdshot are substantially weaker than slugs, presumably they still needed a shotcup with a relatively thick wad to get acceptable patterns, whereas slugs can be loaded practically on top of the powder. In other shotshells, the standard slug is usually the same weight as the standard shot load, or a little lighter; in minishells, the slug is substantially heavier.
Standard length .410 is generally 1/2 ounce of shot; minishells are 11/16 ounce. Same as 3" magnum .410, and also comparable to standard 28 gauge.
But for slugs, .410 is usually 1/4 ounce, while minishells are 7/8 ounce, which is the lightest standard slug for 12 gauge, and heavier than a standard 20 (or even 16) gauge slug. It is maybe 300 fps slower than a 7/8 ounce 12-gauge slug, but it's definitely more like a 20 or 16 than a .410.