.085" is plenty of wall thickness at the juncture of the chamber/cone IMO.
I have a 16 gauge Parker with Damascus barrels that Dr. Gaddy measured at .067" and .065" and he pronounced them safe to shoot under 7,500 psi loads... and I have shot it a lot.
I don't believe the issue is for those who routinely shoot and reload their own ammo unless its an accidental double charge (seen those). However, one pretty well known fellow who does this type work has seen two blown barrels in front of the chambers on Fox 16 gauges after they were extended to 2 3/4". Both of those barrels were in the .085 range. Who knows what they were fed, but accidents do happen. The question will always be when that gun is moved on at some point will someone measure the chambers and see they are 2 3/4" and stuff whatever in there and pull the trigger.
