As used by the Brits, "choke"--depending on the time period in question--only meant that the gun had at least a relatively small amount of constriction. At one point, .008 constriction meant a barrel had to be marked choke--and whoever submitted the gun for proof could request that it be marked choke with less than that. I think .004, if my memory isn't failing. Don't know whether the Germans had something different in mind when they marked a barrel "choke".