In the early days of skeet, the game was shot with the gun in the low position, and with up to a three second delay in the target release. Because of this, the outgoing targets were shot further away than they are today in American skeet, thus binging about the different choking of the two barrels. Sometimes the chokes were called skeet out and skeet in, and also sometimes the right barrel was choked tighter than the left for the same reason. I once has an Iver Johnson Skeeter in .410 that was so choked.