So what abour shooting Ultralites in 2 1/2" chambers? Featherlites? I have some of both but I do not use them in my guns with 2 1/2" chambers.
I accidentally fired a 12 ga Federal Gold Medal paper International 24 gr load in my Wm Evans and I had difficulty in opening the gun, lots of high pressure signs on the brass casehead and the hull tapered significantly where it opened in the leade. Recoil was sharp too.