A KED would have damascus barrels; don't know what the chamber length might be. If your barrels are in good shape, there's no reason not to shoot the gun. My personal practice is to shoot my damascus barreled guns only with low pressure 2.5 inch shells. They're commercially available from RST Shotshells or Polywad (google'em), or you can reload from a number of readily available recipes.

You won't find any disadvantage from using the low pressure ammo on either bunnies or clays and they'll be easier on your shoulder and on your 100+/- year old wood. Good shooting!...Geo