I personally wouldn't stuff long cartridges into it. There is a big difference in the proof pressure test for 2 1/2" chambers and the longer 2 3/4" ones with such a narrow bore. The standard load for these 2 1/2" ones is only 9/16th. ounce of shot whereas the 2 3/4" stuff can have up to 1 ounce. A bit like firing 12 bore 2 3/4" magnums in a 2 1/2" chambered game gun. All the British cartridge makers and all the European ones, as far as I can see, make ammo for the 2 1/2" 28 bore. Lagopus.....