Hey guy's.

I thought the limitation on shotgun actions had to do with the strength of the underlugs, and at higher pressure the action trying to unhinge itself.
Wall or chamber thickness, with modern steels is not the limiting factor.
Without the locking shoulders of a bolt or lever action design, all the thrust is rearward on the standing breech, hinge pin and underlugs.
This is where the third bite helps ( Greener cross bolt, Rising Bite etc )
I would think a 3rd bite and side clips add more than just picking a 10 ga action.

Are the 10 ga lugs that much larger and stronger than a 16 or 12 ga ?

If my hypothesis is flawed please educate me.

Nitro