I'm looking for a significantly lower recoiling buckshot load and found Nobelsport who's an Italian manufacturer.

They offer a 2 1/4 inch mini-shell loaded with 6 pellets of #00 buck at 1250 fps.
This would have much less recoil then standard buckshot or even the standard reduced recoil loads.

I suspect these would be both more reliable feeding and more effective then the Aguila Mini-shells.

Has anyone had any experience with Noblesport buckshot ammo?

Nobelsport buckshot

I have shot Noblesport 2 3/4" 9 pellet 00 and also 2 3/4" 27 pellet #4 buckshot over the years. I do not have any experience with 2 1/4" shells. The 2 3/4" sized shells cycle well in all of my shotguns.