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If you load on one at a time, sure, otherwise there will not be enough pressure from them to cycle reliably if at all.

Hi Devon and welcome. It will fire mini-shells but will not generate enough back pressure to reliably cycle the bolt. Cheers, stay safe and enjoy! Nobel Sport Italia makes some full power mini shells : https://www.gun-tests.com/ammo/12-gauge-mini-shells-from-federal-aguila-and-nobel/