This Paradox is nitro-proofed for 2 1/2" shells. I used fibre wad Eley cartridges of nominal 2 1/2" proof (67mm case length).

The gun has very steep forcing cones, or tapered chambers, which result in the plastic cases becoming slightly feathered at the ends when fired.

With true 65mm cases, I expect the problem to go away.

The next plan is to take it to Corsica to shoot wild boar - H&H have kindly offered me a box of ammo to use.