68% should be somewhere around MOD and IMP. MOD..
Parker chokes were patterned by % of shot that strikes within the particular diameter of the circle used for patterning at the time the gun was made and shot from the particular yardage used in patterning at the time the gun was made. For the sake of arguement, let's suppose that at the time your gun was made Parker Bros. was patterning guns at 40 yards and using a 30" circle so it was patterned so that 68% of the shot fell inside a 30" circle from 40 yards.
Edited after reading Robin's post.
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