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I understand the rules say it's a machine gun if more than 1 projectile comes out of the weapon with a single trigger activation.
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The wording in laws is important. Shotguns fire more than 1 projectile with a single trigger activation.
The wording describing a full auto firearm is usually "fires more than once" or "fires more than a single round", "fires multiple rounds" or something like that. The multiple pellets in a shotgun shell are all contained in a single round of ammunition, and are counted as a single shot.
AS far as US law goes (in my opinion) you could build a gun with a 30 rnd magazine and fire it with 30 triggers and it would not legally be a machine gun, so long as each round needed a separate trigger activation (separate triggers or the same trigger) to fire it.
Multiple trigger, or cam devices to pull a single trigger multiple times are legal, so long as a certain degree of movement (separate activation) is needed to operate it. In other words, a crank, moving a certain number of degrees, by hand, for each round fired is legal (Gatling gun), and not a machine gun. The same gatling gun, motorized, so it is fired multiple times by a single push of a button or switch is legally a machine gun.