You can load single shells into the chamber and fire them, but they will not cycle from the magazine tube correctly/reliably due to their short length.

James, mini shells are perfectly safe to fire in it but they won't have enough energy to completely cycle the bolt back. So you would essentially have a single shot shotgun. As long as you don't mind loading them manually each shot then fire away. Sorry but hope this helps.

James, no sir, mini shells will not cycle in semi-auto shotguns.

No, Unfortunately they will not.

Unfortunately no Sir due to the reduced powder charge combined with the short length of the shell. There is one load that will likely work which is the Nobel Sport Italia (NSI) MiniBuck 6P with a measured muzzle velocity of 1325fps. Some details here : gun-tests.com/ammo/12-gauge-mini-shells-from-federal-aguila-and-nobel/